Biomaterial Database

Timing of naps: effects on post-nap sleepiness levels. 1989

P Lavie, and B Weler

Sleep Laboratory, Faculty of Medicine, Technion - Israel Institute of Technology, Haifa.

The present study investigated the effects of timing of naps on nap content and sleep inertia, and the relationship between pre- and post-nap sleepiness level and nap content. Nine subjects were tested twice on the 13 min waking-7 min resisting sleep paradigm after one night of total sleep deprivation for 24 h. The ultrashort sleep-wake paradigms started at 07.00 h and were interrupted at 15.00 and 19.00 h for 2 h naps. The 2 experimental conditions were counterbalanced across subjects and separated by a 7 day rest period. The results showed that the early nap was significantly more efficient, contained more stage 3/4, and produced less sleep inertia than the late nap. The late nap was more efficient in reducing sleepiness during the last 5 h of the experiments (23.00-04.00). Only the early nap was significantly related to pre- and post-nap sleepiness levels. Overall sleepiness level and the timing of the nocturnal sleepiness gates were significantly correlated between the two parts of the study. The results were interpreted to support the priority of the ultradian phase on prior wakefulness with respect to sleep structure.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D002940	Circadian Rhythm	The regular recurrence, in cycles of about 24 hours, of biological processes or activities, such as sensitivity to drugs or environmental and physiological stimuli.	Diurnal Rhythm,Nyctohemeral Rhythm,Twenty-Four Hour Rhythm,Nycthemeral Rhythm,Circadian Rhythms,Diurnal Rhythms,Nycthemeral Rhythms,Nyctohemeral Rhythms,Rhythm, Circadian,Rhythm, Diurnal,Rhythm, Nycthemeral,Rhythm, Nyctohemeral,Rhythm, Twenty-Four Hour,Rhythms, Circadian,Rhythms, Diurnal,Rhythms, Nycthemeral,Rhythms, Nyctohemeral,Rhythms, Twenty-Four Hour,Twenty Four Hour Rhythm,Twenty-Four Hour Rhythms
D004569	Electroencephalography	Recording of electric currents developed in the brain by means of electrodes applied to the scalp, to the surface of the brain, or placed within the substance of the brain.	EEG,Electroencephalogram,Electroencephalograms
D004576	Electromyography	Recording of the changes in electric potential of muscle by means of surface or needle electrodes.	Electromyogram,Surface Electromyography,Electromyograms,Electromyographies,Electromyographies, Surface,Electromyography, Surface,Surface Electromyographies
D004585	Electrooculography	Recording of the average amplitude of the resting potential arising between the cornea and the retina in light and dark adaptation as the eyes turn a standard distance to the right and the left. The increase in potential with light adaptation is used to evaluate the condition of the retinal pigment epithelium.	EOG,Electrooculograms,Electrooculogram
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000204	Activity Cycles	Bouts of physical irritability or movement alternating with periods of quiescence. It includes biochemical activity and hormonal activity which may be cellular. These cycles are shorter than 24 hours and include sleep-wakefulness cycles and the periodic activation of the digestive system.	Activity Cycle,Cycle, Activity,Cycles, Activity
D000328	Adult	A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available.	Adults
D012890	Sleep	A readily reversible suspension of sensorimotor interaction with the environment, usually associated with recumbency and immobility.	Sleep Habits,Sleeping Habit,Sleeping Habits,Habit, Sleep,Habit, Sleeping,Habits, Sleep,Habits, Sleeping,Sleep Habit
D012892	Sleep Deprivation	The state of being deprived of sleep under experimental conditions, due to life events, or from a wide variety of pathophysiologic causes such as medication effect, chronic illness, psychiatric illness, or sleep disorder.	Inadequate Sleep,Insufficient Sleep,Insufficient Sleep Syndrome,REM Sleep Deprivation,Sleep Debt,Sleep Fragmentation,Sleep Insufficiency,Deprivation, REM Sleep,Deprivation, Sleep,Fragmentation, Sleep,Insufficiencies, Sleep,Insufficiency, Sleep,Insufficient Sleep Syndromes,Sleep Deprivation, REM,Sleep Insufficiencies,Sleep, Inadequate,Sleep, Insufficient,Syndrome, Insufficient Sleep