Showing papers on "Sleep (system call) published in 2007"

The effect of a sleep hygiene education program on the sleep–wake cycle of Brazilian adolescent students

Abstract: Adolescents present with sleep timing delay, irregular sleep-wake (SW) schedules and short sleep duration (<7 h) on school days, all resulting from biological and behavioral factors. To minimize this, we evaluated the effect of a school-based sleep hygiene program on the SW cycle, sleep quality and sleepiness in 58 Brazilian adolescent students. The sleep hygiene program lasted a week and consisted of a daily 50 min activity, such as a sleep physiology class, constructing a sleep ontogeny map, discussing the causes and consequences of adolescent short sleep duration and a quiz about sleep hygiene statements. After this, the students showed a reduction in their index of sleep irregularity (represented by standard deviation from bedtime), their sleep latency decreased and their nap-wake up schedule advanced. Their sleep quality and daytime sleepiness showed no difference. The program was effective in reducing sleep irregularity and latency and advancing nap awaking but could be improved and extended to a larger sample to achieve a better evaluation.

Pattern Recognition of Sleep in Rodents Using Piezoelectric Signals Generated by Gross Body Movements

Abstract: Current research on sleep using experimental animals is limited by the expense and time-consuming nature of traditional EEG/EMG recordings. We present here an alternative, noninvasive approach utilizing piezoelectric films configured as highly sensitive motion detectors. These film strips attached to the floor of the rodent cage produce an electrical output in direct proportion to the distortion of the material. During sleep, movement associated with breathing is the predominant gross body movement and, thus, output from the piezoelectric transducer provided an accurate respiratory trace during sleep. During wake, respiratory movements are masked by other motor activities. An automatic pattern recognition system was developed to identify periods of sleep and wake using the piezoelectric generated signal. Due to the complex and highly variable waveforms that result from subtle postural adjustments in the animals, traditional signal analysis techniques were not sufficient for accurate classification of sleep versus wake. Therefore, a novel pattern recognition algorithm was developed that successfully distinguished sleep from wake in approximately 95% of all epochs. This algorithm may have general utility for a variety of signals in biomedical and engineering applications. This automated system for monitoring sleep is noninvasive, inexpensive, and may be useful for large-scale sleep studies including genetic approaches towards understanding sleep and sleep disorders, and the rapid screening of the efficacy of sleep or wake promoting drugs

Detecting sleep to evaluate therapy

Abstract: A system includes one or more sensors and a processor. Each of the sensors generates a signal as a function of at least one physiological parameter of a patient that may discernibly change when the patient is asleep. The processor monitors the physiological parameters, and determines whether the patient is asleep based on the parameters. In some embodiments, the processor determines plurality of sleep metric values, each of which indicates a probability of the patient being asleep, based on each of a plurality of physiological parameters. The processor may average or otherwise combine the plurality of sleep metric values to provide an overall sleep metric value that is compared to a threshold value in order to determine whether the patient is asleep. In addition, an electroencephalogram signal may be used to identify sleep states of the patient.

Monitoring and control of sleep cycles

Abstract: A system is provided including: a monitor for monitoring a user's sleep cycles; a processor which counts the sleep cycles to provide a sleep cycle count and which selects an awakening time according to a decision algorithm including the sleep cycle count as an input; and an alarm for awakening the user at the awakening time. Use of the sleep cycle count as an input to the decision algorithm advantageously enables a user to more fully control and optimize his or her personal sleeping behavior.

Power management for wireless devices

Abstract: In some embodiments, a method to manage power in a wireless communication device, comprises in a wireless networking adaptor, changing an operational status of a wireless networking adaptor to a sleep mode and transmitting a sleep message from the wireless networking adaptor to a host driver in an electronic device coupled to the networking adaptor, in the electronic device, determining whether a sleep duration specified in the sleep message exceeds a threshold, in response to a determination that the sleep duration specified in the sleep message exceeds a threshold implementing a selective suspend operation on the electronic device, and monitoring for a wake event, and in response to a determination that the sleep duration specified in the sleep message does not exceed a threshold, flushing one or more bulk IN buffers, and monitoring for a wake event.

Multimodality Sensor System for Long-Term Sleep Quality Monitoring

Abstract: Sleep monitoring is an important issue and has drawn considerable attention in medicine and healthcare. Given that traditional approaches, such as polysomnography, are usually costly, and often require subjects to stay overnight at clinics, there has been a need for a low-cost system suitable for long-term sleep monitoring. In this paper, we propose a system using low-cost multimodality sensors such as video, passive infrared, and heart-rate sensors for sleep monitoring. We apply machine learning methods to automatically infer a person's sleep state, especially differentiating sleep and wake states. This is useful information for inferring sleep latency, efficiency, and duration that are important for long-term monitoring of sleep quality in healthy individuals and in those with a sleep-related disorder diagnosis. Our experiments show that the proposed approach offers reasonable performance compared to an existing standard approach (i.e., actigraphy), and that multimodality data fusion can improve the robustness and accuracy of sleep state detection.

Time of day accounts for overnight improvement in sequence learning.

Abstract: The theory that certain skills improve with a night of sleep has received considerable interest in recent years. However, because sleep typically occurs at the same time of day in humans, it is difficult to separate the effects of sleep from those of time of day. By using a version of the Serial Response Time Task, we assessed the role of sleep in implicit sequence learning while controlling for possible time-of-day effects. We replicated the apparent benefit of sleep on human participants. However, our data show that sleep does not affect implicit sequence learning; rather, time of day affects the ability of participants to express what they have learned.

Method and apparatus for assessing sleep quality

Abstract: Systems and/or methods for assessing the sleep quality of a patient in a sleep session are provided. Data is collected from the patient and/or physician including, for example, sleep session data in the form of one or more physiological parameters of the patient indicative of the patient's sleep quality during the sleep session, a subjective evaluation of sleep quality, etc.; patient profile data; etc. A sleep quality index algorithm, which optionally may be an adaptive algorithm, is applied, taking into account some or all of the collected data. Sleep quality data may be presented to at least the patient, and it may be displayed in any suitable format (e.g., a format useful for the patient to be appraised on the progress of the treatment, a format useful for a sleep clinician to monitor progress and/or assess the effectiveness of differing treatment regimens, etc).

Easy wake device

Abstract: A device that monitors a user's sleep cycles and operates to sound an alarm to awaken the user at an optimal point within a sleep cycle. Once an alarm time is set and the alarm is activated, the device begins to monitor a wearer's sleep cycles by identifying the points in time at which the wearer moves his or her body limbs. As the alarm time is approached, the device can trigger the alarm earlier if the wearer is at an optimal point in the sleep cycle or, even retard the triggering of the alarm if the optimal point in the sleep cycle is expected to occur shortly. The device can be used to assist children in waking up to prevent bed wetting, or in a patient for obtaining light therapy.

Apparatus and method for controlling slotted mode of several systems using one sleep controller in a hybrid terminal of a mobile communication system

Abstract: A method for controlling a slotted mode of several systems using one sleep controller enhanced a hybrid sleep controller that performs sleep/wake-up interface of system protocol stacks (PSs) in a hybrid terminal including at least two system PSs used for different communication networks of a mobile communication system. The method includes determining whether there is a shared hardware-waiting system according to a sleep request from a system PS; if there is no shared hardware-waiting system, turning off a clock of the sleep controller and power of shared hardware to enable operation in a real sleep mode; and if there is a shared hardware-waiting system, sending an active command to a corresponding system and simultaneously driving a sleep timer until a time that other systems wake up, to enable operation in a virtual sleep mode.

Uniform out-of-service search for wireless communication systems

Abstract: Techniques for performing uniform out-of-service (UOOS) search to detect for wireless systems are described. The UOOS search is 'uniform' in that sleep cycle and/or awake period are fixed. A wireless device transitions to an OOS state upon detection of OOS conditions for a radio access technology (RAT). The wireless device performs system search during the awake period of each sleep cycle while in the OOS state. The awake period may have a first fixed time duration, and the sleep cycle may have a second fixed time duration. In each awake period, the wireless device may either start a new search or resume a prior search based on saved state information if the search was not completed in a prior awake period. In each awake period, the wireless device may (i) start and complete a search for recently acquired frequency channels and systems and (ii) start or resume a search for other frequency channels and systems in one or more RATs.

Method and system employing wideband signals for RF wakeup

Abstract: A method of reducing an energy consumption of a wireless network, the method including periodically entering a sleep mode by a receiver node, broadcasting a signal simultaneously across a wide band frequency range, upon waking up from the sleep mode, listening by the receiver node to only a first narrow part of the wide band frequency range, the receiver node subsequently either returning to sleep if a signal strength of the broadcasted signal is less than a predefined signal strength threshold, or staying awake for an additional period of time if the signal strength of the broadcasted signal is greater than the predefined signal strength threshold.

Nightly Sleep Duration in the 2-Week Period Preceding Multiple Sleep Latency Testing

Abstract: Study Objective:To assess usual nightly sleep duration of patients referred for a Multiple Sleep Latency Test (MSLT).Design:Retrospective chart review.Setting:Military, hospital-based, sleep center...

Apparatus and method for adaptive sleep of wirelessly networked devices

Abstract: A system and method for power saving in a wireless network for transmitting uncompressed audio/video (A/V) data disclosed. The method includes an adaptive sleep period scheme in which the current sleep period is computed based at least partly on one or more previous sleep periods. The method also includes entering an inactive state by a coordinator as well as non-coordinator stations in the wireless network in which no beacons are transmitted.

Method to control sleep operation of air conditioner

Abstract: A method to control the sleep operation of an air conditioner is provided. The method includes determining whether or not a sleep operation is activated and sequentially performing a plurality of sub-modes of the sleep operation when the sleep operation is activated.

Adaptive Power Saving Algorithm for Mobile Subscriber Station in 802.16e

Abstract: WiMAX standard for mobility (IEEE 802.16e) addresses the issues related to energy conservation at Mobile Subscriber Station (MSS) in sleep mode. In 802.16e the sleep mode is exponentially distributed according to traffic, The algorithm that deals with sleep mode energy consumption in 802.16e network does not address the problem of varying traffic rates. This paper proposes an adaptive sleep mode interval control algorithm for 802.16e, which takes into account the downlink traffic pattern to minimize energy consumption. Moreover, we characterize the standardized sleep mode in IEEE 802.16e MSS taking into account various situation like, moving into sleep, listening or wake-up modes. It has been observed that our proposed algorithm for sleep mode saves substantial amount of energy at lower traffic and almost same at higher traffic as compared to 802.16e. The results reveal that the optimization of sleep mode leads to decrease in average waiting time delay at MSS. Furthermore, our analytical evaluations are close to simulation results.

Power supply device

Abstract: A power supply device is disclosed in which a power supply control unit thereof includes (i) a sleep mode switch that switches the device from a ready mode to a sleep mode, and at the same time, turns off a display, if a predetermined condition is satisfied, (ii) a sleep operation mode switch that switches the device from the sleep mode to a sleep operation mode if a job request is received during the sleep mode from an external device that is connected to the power supply device via a network, and switches the sleep operation mode to the sleep mode if the requested job is completed during the sleep operation mode, and (iii) an input operation detector that detects an input operation made during the sleep operation mode. The sleep operation mode switch switches the device to the ready mode if the input operation detector detects an input operation during the sleep operation mode.

Adaptive sleep mode algorithm in IEEE 802.16e

Abstract: Much research has been performed to minimize energy consumption of mobile nodes with high speed mobility. Among them, the IEEE 802.16e has adopted sleep mode to reduce energy consumption. If the base station (BS) has no data to be sent to a mobile node at the instant of ending its current sleep window interval, the mobile node with the sleep mode increases the sleep window interval by double until the window interval reaches to the maximum sleep window interval. After the sleep window interval of the mobile node hits the maximum sleep window interval, the node keeps its sleep window interval as the maximum interval. However, if the node keeps the maximum sleep window interval for a long time, the frame delay is increased and energy is wasted. To shorten the frame delay and deal with the energy of the node effectively, this paper comes up with an algorithm that reduces the next sleep window interval to the medium between the minimum and the maximum sleep window interval after the current sleep window reaches to the maximum sleep window interval. The proposed algorithm decreases the delay by a maximum of 20% and energy consumption by about 5%, compared with the basic algorithm adopted by IEEE 802.16e.

Sleep optimization for mobile devices in a wireless network

Abstract: Briefly, in accordance with one or more embodiments, a subscriber station in sleep mode is capable of sending and/or receiving traffic during sleep mode without violating the delay requirements of best effort traffic. Moreover, a subscriber station is capable of remaining in sleep and may optionally only be awaken in the event there is data to be transmitted from the base station to the subscriber station and/or from the subscriber station to the base station. By implementing an always sleep and need based wake up arrangement, the power consumption of the subscriber station can be reduced.

Sleep mode optimization for increasing battery life in broadband wireless communication devices

Abstract: A method in a wireless communication terminal including transmitting a sleep mode request message (400) to a wireless communication network and indicating information about a sleep mode ratio, for example, decimal and integer values, in the sleep mode request message. The sleep mode ratio is formed by a ratio of successive sleep window durations, which are separated by a monitoring interval during which the wireless communication terminal monitors a channel.

Sleep information providing system

Abstract: PROBLEM TO BE SOLVED: To reduce time and cost required in a system providing sleep information via a communication line. SOLUTION: A signal processing unit (20) receives raw data about physiological information of a sleeping subject from a sleep sensor, extracts sleep information indicating sleeping condition of the subject from the received raw date, and stores extracted sleep data sequentially, for example, at one-minute intervals. A terminal PC (35) transmits the sleep data acquired from the signal processing unit (20) to a central server (30). That is, the sleep data having relatively less information amount obtained from the signal processing unit (20) is transmitted to the central server (30) of the terminal PC (35), instead of the raw data acquired from the sleep sensor. The central server (30) generates a sleep report with a chart of the received sleep data, and transmits the sleep report to the terminal PC (35). COPYRIGHT: (C)2007,JPO&INPIT

Synchronization of multi-system wakeup

Abstract: A method (200) for synchronizing wakeup of a second communication device (115) with wakeup of a first communication device (110). The method can include, on the first communication device, receiving a first message (135) from a communications network. The first message can indicate a first sleep/wake interval to be implemented on the first communication device. The method also can include communicating a second message (150) from the first communication device to the second communication device. The second message can indicate a second sleep/wake interval to be implemented on the second communication device. The second sleep/wake interval can be synchronized with the first sleep/wake interval. In one arrangement, the second sleep/wake interval can indicate to the second communication device to wakeup from sleep mode immediately after the first communication device has woken up from sleep mode.

An analytic model of IEEE 802.16e sleep mode operation with correlated traffic

Abstract: We propose and analyse a discrete-time queueing model for the evaluation of the IEEE 802.16e sleep mode operation in wireless access networks. This mechanism reduces the energy consumption of a mobile station (MS) by allowing it to turn off its radio interface (sleep mode) when there is no traffic present at its serving base station (BS). After a sleep period expires, the MS briefly checks the BS for data packets and switches off for the duration of another sleep period if none are available. Specifically for IEEE 802.16e, each additional sleep period doubles in length, up to a certain maximum. Clearly, the sleep mode mechanism can extend the battery life of the MS considerably, but also increases the delay at the BS buffer. For the analysis, we use a discrete-time queueing model with general service times and multiple server vacations. The vacations represent the sleep periods and have a length depending on the number of preceding vacations. Unlike previous studies, we take the traffic correlation into account by assuming a D-BMAP arrival process. The distribution of the number of packets in the queue is obtained at various sets of time epochs, as well as the mean packet delay and the mean number of consecutive vacations. We apply these results to the IEEE 802.16e sleep mode mechanism with downlink traffic. By means of some examples, we show the influence of both the configuration parameters and the traffic correlation on the delay and the energy consumption.

Adaptive power saving method for wireless mobile packet communication system

Abstract: When selecting size of initial sleep window, the disclosed self-adapting sleep mechanism of comm system based on wireless mobile packets does not take a fixed value, instead select a suitable value based on previous features of window Mean while, adjusting size of sleep window by self-adaptation, the invention reduces unnecessary conversion from sleep window to listening window of mobile station (MS) effectively so as to raise efficiency for saving power, prolong service time of batteries of MS, and raise use ratio of wireless resource The method includes procedures: after MS awakens from a time of sleep mode, through a certain time of no service state, and enters into next time of sleep mode, the invention feeds back parameters of previous sleep state and traffic performance parameters to base station Based on received information, base station calculates size of initial sleep window, and adjusted size of sleep window, and informs them to MS

Enhanced host sleep for WLAN devices

Abstract: A host assembly is communicatively coupled to a wireless device assembly via a first interface and via a second interface. A first signal is received at the wireless device assembly from the host assembly. The first signal indicates a request for the wireless device assembly to enter a host sleep mode of operation. In response to receiving the first signal, the wireless device assembly transmits a third signal to the host assembly, wherein the third signal indicates entry into the host sleep mode of operation. Subsequent to transmitting the third signal to the host assembly via the first interface, the wireless device assembly enters into the host sleep mode of operation. While in the host sleep mode of operation, the wireless device assembly transmits, via the second interface, the second signal, and, after transmitting the second signal to the host assembly, exits the host sleep mode of operation.

Alarm process and device

Abstract: An alarm process and device capable of waking a user more comfortably by means of a rousing instrument. For example, an alarm device may rouse a user a predetermined time before a desired waking time, resetting the user's sleep cycle before waking. A user may then be woken more comfortably at a desired waking time and during a preferable stage of the sleep cycle.

Sleep evaluation apparatus

Abstract: PROBLEM TO BE SOLVED: To provide a sleep evaluation apparatus for properly evaluating a quality of sleep. SOLUTION: The sleep evaluation apparatus 1 is provided with a respiration detection unit 7 that detects changes in respiration and outputs respiration signals. CPU 6 generates six primary parameters indicating sleep states based on the respiration signals and consolidated four secondary parameters based on the primary parameters. The secondary parameters are linearly independent of one another. Evaluation unit 20 computes a sleep score indicating the degree of the quality of sleep by multiplying each of the six secondary parameters by second coefficients and totalizing results of the multiplications. Results of the evaluations are displayed on display unit 4. COPYRIGHT: (C)2009,JPO&INPIT

Sleep controlling apparatus, method, and program

Abstract: PROBLEM TO BE SOLVED: To provide a sleep controlling apparatus which enables a subject to wake up at a timing at which the subject can wake up comfortably. SOLUTION: The sleep controlling apparatus includes measurement means 20 for measuring the biological information of a subject, first detection means 144 for detecting the subject who is in a state of sleeping, REM sleep, light non-REM sleep, or deep non-REM sleep from the biological information, first stimulation means 152 for giving a first stimulation to the subject with a stimulation strength less than a predetermined threshold when the first detection means 144 detects the light non-REM sleep, and second stimulation means 152 for giving a second stimulation with a stronger stimulation strength than the first stimulation to the subject after the first stimulation means 152 gives the first stimulation. COPYRIGHT: (C)2009,JPO&INPIT

Bluetooth Based Wireless Sleep Remote Monitoring System

Abstract: Sleep disorder, such as Obstructive sleeps apnoea (OSA), and is now regarded as an important risk factor for cardiovascular diseases. Traditional sleep monitoring system contains several biomedical signals recording set, such as EEG, EOG, EMG ECG respiration and SpO2. The increasing demands of home healthcare for sleep drive studies to monitor sleep by simple method. This paper proposed an ECG-based wireless sleep monitoring system, which contains a Bluetooth-based ECG transmission system, and algorithms to monitor OSA by ECG-derived features, with clustering sensitivity 77% and specificity 90%. This system is believed to be a good candidate to meet the future demand on home-based sleep monitoring, and it can reduce the abundant burdens of hospital sleep centers.

Separation of natural and drug-induced sleep of a subject

Abstract: The invention relates to a mechanism for detecting whether a sleep state of a subject is due to natural sleep or induced by drugs. An indicator indicative of the activation of the autonomic nervous system of the subject is derived based on cardiovascular signal data measured from the subject and the indicator is employed to identify whether the sleep of the subject is drug-induced sleep or natural sleep. The identification is performed upon detection of a sleep state.