Journal ArticleDOI
Subjective and Objective Sleepiness in the Active Individual
Torbjörn Åkerstedt,Mats Gillberg +1 more
Reads0
Chats0
TLDR
The results support the notion that ambulatory EEG/EOG changes may be used to quantify sleepiness and suggest physiological changes due to sleepiness are not likely to occur until extreme sleepiness is encountered.Abstract:
Eight subjects were kept awake and active overnight in a sleep lab isolated from environmental time cues. Ambulatory EEG and EOG were continuously recorded and sleepiness ratings carried out every two hours as was a short EEG test session with eyes open for 5 min and closed for 2 min. The EEG was subjected to spectral analysis and the EOG was visually scored for slow rolling eye movements (SEM). Intrusions of SEM and of alpha and theta power density during waking, open-eyed activity strongly differentiated between high and low subjective sleepiness (the differentiation was poorer for closed eyes) and the mean intraindividual correlations between subjective and objective sleepiness were very high. Still, the covariation was curvilinear; physiological indices of sleepiness did not occur reliably until subjective perceptions fell between "sleepy" and "extremely sleepy-fighting sleep"; i.e. physiological changes due to sleepiness are not likely to occur until extreme sleepiness is encountered. The results support the notion that ambulatory EEG/EOG changes may be used to quantify sleepiness.read more
Citations
More filters
Journal ArticleDOI
The Cumulative Cost of Additional Wakefulness: Dose-Response Effects on Neurobehavioral Functions and Sleep Physiology From Chronic Sleep Restriction and Total Sleep Deprivation
TL;DR: It appears that even relatively moderate sleep restriction can seriously impair waking neurobehavioral functions in healthy adults, and sleep debt is perhaps best understood as resulting in additional wakefulness that has a neurobiological "cost" which accumulates over time.
Journal ArticleDOI
An overview of sleepiness and accidents.
TL;DR: The association between neurobiologically‐based sleepiness/fatigue and human‐error related accidents is reviewed and it concludes that fatigue contributes to human error and accidents in technology‐rich, industrialized societies in terms of human, environmental and economic impacts.
Journal ArticleDOI
Evening use of light-emitting eReaders negatively affects sleep, circadian timing, and next-morning alertness
Anne Marie Chang,Anne Marie Chang,Daniel Aeschbach,Daniel Aeschbach,Daniel Aeschbach,Jeanne F. Duffy,Jeanne F. Duffy,Charles A. Czeisler,Charles A. Czeisler +8 more
TL;DR: It is found that the use of portable light-emitting devices immediately before bedtime has biological effects that may perpetuate sleep deficiency and disrupt circadian rhythms, both of which can have adverse impacts on performance, health, and safety.
Journal ArticleDOI
Systematic interindividual differences in Neurobehavioral impairment from sleep loss: Evidence of trait-like differential vulnerability
TL;DR: There was strong evidence that interindividual differences in neurobehavioral deficits during sleep deprivation were systematic and trait-like, and not explained by subjects' baseline functioning or a variety of other potential predictors.
Journal ArticleDOI
Validation of the Karolinska sleepiness scale against performance and EEG variables
Kosuke Kaida,Masaya Takahashi,Torbjörn Åkerstedt,Akinori Nakata,Yasumasa Otsuka,Takashi Haratani,Kenji Fukasawa +6 more
TL;DR: The Karolinska sleepiness scale was closely related to EEG and behavioral variables, indicating a high validity in measuring sleepiness and may be a useful proxy for EEG or behavioral indicators of sleepiness.
References
More filters
Book
Nonparametric statistics for the behavioral sciences
TL;DR: This is the revision of the classic text in the field, adding two new chapters and thoroughly updating all others as discussed by the authors, and the original structure is retained, and the book continues to serve as a combined text/reference.
Journal ArticleDOI
Catastrophes, sleep, and public policy: consensus report
Merrill M. Mitler,Mary A. Carskadon,Charles A. Czeisler,William C. Dement,David F. Dinges,R C Graeber +5 more
TL;DR: It is found that the occurrence of a wide range of catastrophic phenomena are influenced by sleep-related processes in ways heretofore not fully appreciated and occur most often at times of day coincident with the temporal pattern of brain processes associated with sleep.
Journal ArticleDOI
Sleepiness on the job: continuously measured EEG changes in train drivers.
Lars Torsvall,Torbjörn Åkerstedt +1 more
TL;DR: It was concluded that EEG and EOG parameters closely reflect variations in sleepiness on the job and that these parameters, together with self-ratings, demonstrate that severe sleepiness may occur in train drivers during night work.
Journal ArticleDOI
The EEG of drowsiness in normal adults.
Joan Santamaria,Keith H. Chiappa +1 more
TL;DR: The EEG of Drowsiness in Normal Adults Joan Santamaria; Keith Chiappa; Journal of Clinical Neurophysiology.
Journal ArticleDOI
Extreme sleepiness: quantification of EOG and spectral EEG parameters
Lars Torsvall,Torbjörn Åkerstedt +1 more
TL;DR: Behavioral sleepiness is systematically reflected in spectral EEG and EOG parameters and the results support attempts to use these variables to indicate sleepiness in active subjects in real life situations.
Related Papers (5)
Microcomputer analyses of performance on a portable, simple visual RT task during sustained operations
David F. Dinges,John W. Powell +1 more