Sleep disturbance caused by meaningful sounds and the effect of background noise
TL;DR: In this paper, a new procedure called "noise interrupted method" has been developed to study noise-induced sleep disturbance, where the sounds are reproduced with a mini-disk player which has an automatic reverse function.
About: This article is published in Journal of Sound and Vibration.The article was published on 2004-10-22. It has received 22 citations till now. The article focuses on the topics: Sleep disorder & Disturbance (geology).
Citations
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TL;DR: In this paper, the effects of sound on man are reviewed with emphasis on the physiological reaction mechanisms and the ultimate stress reaction and the practical consequences of these reaction patterns in terms of prevention are discussed.
Abstract: The effects of sound on man are reviewed with emphasis on the physiological reaction mechanisms and the ultimate stress reaction. It is seen that energy related noise levels are poor predictors for the reactions in man as noise is always interpreted in the central nervous system, generating secondary and tertiary reactions that are not controlled by the brain cortex. The stimulation of these reaction pathways in acute situations lead to involuntary reflexes and feelings of fright and despair. In chronic exposure situations a give-up stage may develop with reduced corporal and mental functions. In the acoustical panorama peak level noises usually cause the most pronounced effects as they stimulate reactions of fear and flight. The practical consequences of these reaction patterns in terms of prevention are discussed.
16 citations
TL;DR: The purpose of this study is to elucidate the sleep-inducing factors of running cars or trains, and the final goal is to develop a sleep inducing machine which reproduces the mechanical environment for sleep.
Abstract: In running cars or trains, passengers are often getting sleepy. We focus on this physiological phenomenon. If a machine can reproduce this phenomenon, it is feasible to put insomnia patients or infants to sleep without any harmful effects. This will bring extreme benefit for insomnia patients or parents of babies. The purpose of this study is to elucidate the sleep-inducing factors of running cars or trains, and the final goal is to develop a sleep inducing machine which reproduces the mechanical environment for sleep. For the first step, this study investigated the relationship between sleepiness and vibrations on several trains. The sleepability of each train is discussed by the ratio of sleeping passengers (RSP). High RSP trains can be recognized as comfortable to sleep. The acceleration profile of trains is analyzed by FFT and jerks. The results suggest that the comfortable train has mainly low-frequency (under 2.0 Hz) vibrations with particular fluctuation. Small jerk also contributes the sleepability. A prototype sleep inducing machine is tested with several subjects. The questionnaire survey indicates that near 1.0 Hz excitation is the most comfortable vibration for sleep. This result supports our hypothesis.
14 citations
TL;DR: The results of excitation experiments with 10 subjects showed a significant difference in sleep latency between the conditions with vibration and without vibration, suggesting the ability of appropriate vibration to induce sleep.
Abstract: In running cars or trains, passengers often feel sleepy. Our study focuses on this physiological phenomenon. If a machine can reproduce this phenomenon, it is feasible to put a person, such as an insomnia patient or an infant, to sleep without any harmful effects. The results of our previous study suggest that low-frequency vibration induces sleep. This report describes a new mechanical bed for inducing sleep and discusses the effects of different vibration conditions. The new bed has two active DOFs in the vertical and horizontal directions to examine the anisotropy of sensation. The bed includes three main parts: a vertical driver unit, a horizontal driver unit, and a unique 2-DOF counterweight system to reduce driving force and noise. With regard to motion accuracy, the maximum motion error in the vertical direction lifting 75 kg load was only 0.06 mm with a 5.0 mm amplitude of a 0.5 Hz sinusoidal wave. The results of excitation experiments with 10 subjects showed a significant difference in sleep latency between the conditions with vibration and without vibration. Furthermore, the average latency with insensible vibration (amplitude = 2.4 mm) was shorter than that with sensible vibration (amplitude = 7.5 mm). These results suggest the ability of appropriate vibration to induce sleep.
9 citations
Cites background from "Sleep disturbance caused by meaning..."
...In our previous study, a tendency is observed where the low-frequency vibration of a running train make people fall asleep [1]....
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TL;DR: In this paper, the authors investigated the effect of noise on sleep in subjects' own houses using recorded traffic noises, such as railway noise and two kinds of road traffic noise differing in levelfluctuations were used as stimuli.
7 citations
TL;DR: In this paper , the authors comprehensively summarized and analyzed the recent studies and common utilization forms of smart ventilation and PV systems that are based on CO 2 concentration control, to pave path and provide some guidelines for their integration application for reducing energy consumption and improving indoor thermal comfort.
5 citations
References
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TL;DR: It might be concluded that the WHO recommendation of L eq = 35 dB(A) is adequate, but should be supplemented with a maximum noise level, as expressed for example in L pmax or L I , that should not be exceeded.
63 citations
Journal Article•
TL;DR: The causal linkage between environmental noise, primary and secondary effects, and the hypothesized contribution to multifactorial chronic diseases, to chronic annoyance, and to permanent behavioural alterations are focused on.
Abstract: The permanently open auditory channel and the ability of the brain to process incoming acoustical stimuli even while asleep and to respond adequately is the essential precondition for noise-induced sleep disturbances which are regarded as the most deleterious effects of noise. In the past, research was mainly focused on the detection and description of the various effects of noise, on the influence of personal and environmental factors, on the determination of dose response relations and the definition of critical noise loads, above which noise becomes intolerable. These limits are, however, as yet only tentative or applicable for a very few situations and need to be verified or revised.
The present paper is focused on the priorities for future research. These are in particular 1) the causal linkage between environmental noise, primary and secondary effects on the one hand and the hypothesized contribution to multifactorial chronic diseases, to chronic annoyance, and to permanent behavioral alterations on the other hand, 2) the identification of the causes for the great discrepancies between the small effects determined in the field and the large responses recorded in the laboratory, 3) temporal aspects such as sleep at unusual times (day sleep after nightshifts), definition of night-time and day-time, 4) the significance of the shoulder hours for subsequent sleep, 5) the individual vulnerability, 6) the accumulation of data from different studies.
49 citations
TL;DR: It is suggested that to protect people from sleep disturbance effects from road traffic noise, it is necessary to consider the number of vehicles of a certain maximum noise level.
40 citations
TL;DR: In this paper, the authors proposed the critical load for continuous noise as 40 dBA indoors and the admissible risk for intermittent noise is determined by a curve which relates the maximum levels to the number of the single noise events.
32 citations