Biomaterial Database

[Circadian rhythm in normal and pathological sleep]. 1996

M Billiard, and B Carlander, and A Besset

Service de Neurologie B, Hôpital Gui-de-Chauliac, Montpellier, France.

Different challenges, constraints for quality of sleep and wakefulness, sleep in extreme conditions, search for a better identification of disorders of sleep and wakefulness, spur researches on the circadian rhythm of sleep and on its disorders. Any advance in that field rests on the understanding of different physiologic phenomena: the intrinsic period of our internal clock is not 24-hours but a little less than 25-hours and it must be reset daily by the Zeitgebers. A sudden phase shift provokes an external desynchronisation. In addition not all rhythms resynchronize together resulting in an internal desyncronization. There is a close relationship between quantities of total sleep and REM sleep and the time of sleep onset within the 24-hours. The propensity to sleep follows a circasemidian rhythm with a major peak during the night and a secondary peak in the midafternoon. Disorders of the circadian rhythm of sleep are of two types: related to the misalignment of the sleep-wake schedule and the synchronizer-controlled rest-activity rhythm (shift work sleep disorder and time zone change syndrome) or related to an abnormal escape of the individual rest-activity rhythm from synchronizer control (delayed sleep phase syndrome, advanced sleep phase syndrome and non 24-hour sleep-wake syndrome.

UI	MeSH Term	Description	Entries
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
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D001683	Biological Clocks	The physiological mechanisms that govern the rhythmic occurrence of certain biochemical, physiological, and behavioral phenomena.	Biological Oscillators,Oscillators, Endogenous,Pacemakers, Biological,Biologic Clock,Biologic Oscillator,Biological Pacemakers,Clock, Biologic,Clocks, Biological,Oscillator, Biologic,Oscillators, Biological,Pacemaker, Biologic,Pacemakers, Biologic,Biologic Clocks,Biologic Oscillators,Biologic Pacemaker,Biologic Pacemakers,Biological Clock,Biological Oscillator,Biological Pacemaker,Clock, Biological,Clocks, Biologic,Endogenous Oscillator,Endogenous Oscillators,Oscillator, Biological,Oscillator, Endogenous,Oscillators, Biologic,Pacemaker, Biological
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
D012893	Sleep Wake Disorders	Abnormal sleep-wake schedule or pattern associated with the CIRCADIAN RHYTHM which affect the length, timing, and/or rigidity of the sleep-wake cycle relative to the day-night cycle.	Sleep Disorders,Long Sleeper Syndrome,Short Sleep Phenotype,Short Sleeper Syndrome,Sleep-Related Neurogenic Tachypnea,Subwakefullness Syndrome,Disorder, Sleep,Disorder, Sleep Wake,Disorders, Sleep,Disorders, Sleep Wake,Long Sleeper Syndromes,Neurogenic Tachypnea, Sleep-Related,Neurogenic Tachypneas, Sleep-Related,Phenotype, Short Sleep,Phenotypes, Short Sleep,Short Sleep Phenotypes,Short Sleeper Syndromes,Sleep Disorder,Sleep Phenotypes, Short,Sleep Related Neurogenic Tachypnea,Sleep Wake Disorder,Sleep-Related Neurogenic Tachypneas,Sleeper Syndrome, Long,Sleeper Syndrome, Short,Sleeper Syndromes, Long,Sleeper Syndromes, Short,Subwakefullness Syndromes,Syndrome, Long Sleeper,Syndrome, Short Sleeper,Syndrome, Subwakefullness,Syndromes, Long Sleeper,Syndromes, Short Sleeper,Syndromes, Subwakefullness,Tachypnea, Sleep-Related Neurogenic,Tachypneas, Sleep-Related Neurogenic,Wake Disorder, Sleep,Wake Disorders, Sleep
D014195	Travel	MOVEMENT across different GEOGRAPHIC LOCATIONS.	Land Travel,Sea Travel,Land Travels,Sea Travels,Travel, Land,Travel, Sea,Travels,Travels, Land,Travels, Sea
D014937	Work	Productive or purposeful activities.
D014940	Work Schedule Tolerance	Physiological or psychological effects of periods of work which may be fixed or flexible such as flexitime, work shifts, and rotating shifts.	Schedule Tolerance, Work,Schedule Tolerances, Work,Tolerance, Work Schedule,Tolerances, Work Schedule,Work Schedule Tolerances