SettingsCircadian rhythms
Actigraphy
Actigraphy is a relatively non-invasive method of monitoring human rest/activity cycles.
Actigraphy is a relatively non-invasive method of monitoring human rest/activity cycles.
Advanced sleep phase disorder
Advanced sleep phase disorder, also known as the advanced sleep-phase type of circadian rhythm sleep disorder or advanced sleep phase syndrome, is a condition in which patients feel very sleepy ...
Advanced sleep phase disorder, also known as the advanced sleep-phase type of circadian rhythm sleep disorder or advanced sleep phase syndrome, is a condition in which patients feel very sleepy ...
Advanced sleep phase syndrome
Advanced sleep phase syndrome (ASPS), also known as the advanced sleep-phase type (ASPT) of circadian rhythm sleep disorder, is a condition in which patients feel very sleepy and go ...
Advanced sleep phase syndrome (ASPS), also known as the advanced sleep-phase type (ASPT) of circadian rhythm sleep disorder, is a condition in which patients feel very sleepy and go ...
Bacterial circadian rhythms
Bacterial circadian rhythms, like other circadian rhythms, are endogenous "biological clocks" that have the following three characteristics: (a) in constant conditions (i.e.
Bacterial circadian rhythms, like other circadian rhythms, are endogenous "biological clocks" that have the following three characteristics: (a) in constant conditions (i.e.
Chronobiology
Chronobiology is a field of biology that examines periodic phenomena in living organisms and their adaptation to solar- and lunar-related rhythms.
Chronobiology is a field of biology that examines periodic phenomena in living organisms and their adaptation to solar- and lunar-related rhythms.
Chronobiotic
Chronobiotic is a substance that is capable of therapeutically re-entering short - term dissociated or long - term desynchronized circadian rhythms, or prophylactically preventing their disrupti...
Chronobiotic is a substance that is capable of therapeutically re-entering short - term dissociated or long - term desynchronized circadian rhythms, or prophylactically preventing their disrupti...
Chronotherapy
Chronotherapy refers to the use of circadian or other rhythmic cycles in the application of therapy.
Chronotherapy refers to the use of circadian or other rhythmic cycles in the application of therapy.
Chronotype
Chronotype is an attribute of animals, including human beings, reflecting at what time of the day their physical functions are active, change or reach a certain level.
Chronotype is an attribute of animals, including human beings, reflecting at what time of the day their physical functions are active, change or reach a certain level.
Circadian clock
A circadian rhythm is an endogenously driven roughly 24-hour cycle in biochemical, physiological, or behavioural processes.
A circadian rhythm is an endogenously driven roughly 24-hour cycle in biochemical, physiological, or behavioural processes.
Circadian oscillator
Circadian oscillators are components of the biological clocks that regulate the activities of organisms in relation to environmental cycles and provide an internal temporal framework.
Circadian oscillators are components of the biological clocks that regulate the activities of organisms in relation to environmental cycles and provide an internal temporal framework.
Circadian rhythm
A circadian rhythm is any biological process which displays an endogenous, entrainable oscillation of about 24 hours.
A circadian rhythm is any biological process which displays an endogenous, entrainable oscillation of about 24 hours.
Circadian rhythm sleep disorder
Circadian rhythm sleep disorders are a family of sleep disorders affecting, among other things, the timing of sleep.
Circadian rhythm sleep disorders are a family of sleep disorders affecting, among other things, the timing of sleep.
Circaseptan
A circaseptan rhythm is a cycle consisting of 7 days in which many biological processes of life resolve.
A circaseptan rhythm is a cycle consisting of 7 days in which many biological processes of life resolve.
Dark therapy
Dark therapy is an experimental treatment which involves eliminating all light in the subject's environment, for a period of six to sixteen hours per day, in combination with a regular sleep sch...
Dark therapy is an experimental treatment which involves eliminating all light in the subject's environment, for a period of six to sixteen hours per day, in combination with a regular sleep sch...
David F. Dinges
David F. Dinges is a major American sleep researcher and teacher.
David F. Dinges is a major American sleep researcher and teacher.
Dawn simulation
Dawn simulation is a technique originally developed to help treat seasonal affective disorder, but can be used as a soundless alarm clock to wake up the body naturally.
Dawn simulation is a technique originally developed to help treat seasonal affective disorder, but can be used as a soundless alarm clock to wake up the body naturally.
Delayed sleep phase disorder
Delayed sleep-phase syndrome (DSPS), also known as delayed sleep-phase disorder (DSPD) or delayed sleep-phase type (DSPT), is a circadian rhythm sleep disorder, a chronic disorder of...
Delayed sleep-phase syndrome (DSPS), also known as delayed sleep-phase disorder (DSPD) or delayed sleep-phase type (DSPT), is a circadian rhythm sleep disorder, a chronic disorder of...
Delayed sleep phase syndrome
Delayed sleep-phase syndrome (DSPS), also known as delayed sleep-phase disorder (DSPD) or delayed sleep-phase type (DSPT), is a circadian rhythm sleep disorder, a chronic disorder of...
Delayed sleep-phase syndrome (DSPS), also known as delayed sleep-phase disorder (DSPD) or delayed sleep-phase type (DSPT), is a circadian rhythm sleep disorder, a chronic disorder of...
Diurnality
Diurnality is a plant or animal behavior characterized by activity during the day and sleeping at night.
Diurnality is a plant or animal behavior characterized by activity during the day and sleeping at night.
Entrainment (chronobiology)
Entrainment, within the study of chronobiology, occurs when rhythmic physiological or behavioral events match their period and phase to that of an environmental oscillation.
Entrainment, within the study of chronobiology, occurs when rhythmic physiological or behavioral events match their period and phase to that of an environmental oscillation.
Franz Halberg
Franz Halberg (born July 5, 1919) is a scientist and one of the founders of modern chronobiology.
Franz Halberg (born July 5, 1919) is a scientist and one of the founders of modern chronobiology.
Free-running sleep
Free-running sleep experiments can involve any organism which sleeps.
Free-running sleep experiments can involve any organism which sleeps.
Giant retinal ganglion cells
Giant retinal ganglion cells are photosensitive ganglion cells with large dendritic trees discovered in the human and macaque retina by Dacey et al.
Giant retinal ganglion cells are photosensitive ganglion cells with large dendritic trees discovered in the human and macaque retina by Dacey et al.
Infradian rhythm
An infradian rhythm is a rhythm with a period longer than the period of a circadian rhythm, i.e. with a frequency less than one cycle in 24 hours, such as menstruation, breeding, tidal or season...
An infradian rhythm is a rhythm with a period longer than the period of a circadian rhythm, i.e. with a frequency less than one cycle in 24 hours, such as menstruation, breeding, tidal or season...
Irregular sleep-wake rhythm
Irregular sleep–wake rhythm is a rare form of circadian rhythm sleep disorder.
Irregular sleep–wake rhythm is a rare form of circadian rhythm sleep disorder.
Jet lag
Jet lag, medically referred to as desynchronosis, is a physiological condition which results from alterations to the body's circadian rhythms resulting from rapid long-distance transmeridi...
Jet lag, medically referred to as desynchronosis, is a physiological condition which results from alterations to the body's circadian rhythms resulting from rapid long-distance transmeridi...
Jürgen Aschoff
Jürgen Walther Ludwig Aschoff was a German physician, biologist and behavioral physiologist.
Jürgen Walther Ludwig Aschoff was a German physician, biologist and behavioral physiologist.
Lark (person)
Lark is a term used to describe a person who usually gets up early in the morning and goes to bed early in the evening.
Lark is a term used to describe a person who usually gets up early in the morning and goes to bed early in the evening.
Light effects on circadian rhythm
Numerous organisms maintain inherent individual daily rhythms to biological processes, known as circadian rhythms, that assist the organism in maintaining functional periodicity relative to the ...
Numerous organisms maintain inherent individual daily rhythms to biological processes, known as circadian rhythms, that assist the organism in maintaining functional periodicity relative to the ...
Light in school buildings
Light in school buildings traditionally is from a combination of daylight and electric light to illuminate classrooms, hallways, cafeterias, offices and other interior areas.
Light in school buildings traditionally is from a combination of daylight and electric light to illuminate classrooms, hallways, cafeterias, offices and other interior areas.
Light therapy
Light therapy or phototherapy (classically referred to as heliotherapy) consists of exposure to daylight or to specific wavelengths of light using lasers, light-emitting diodes, fluo...
Light therapy or phototherapy (classically referred to as heliotherapy) consists of exposure to daylight or to specific wavelengths of light using lasers, light-emitting diodes, fluo...
Melanopsin
Melanopsin is a photopigment found in specialized photosensitive ganglion cells of the retina that are involved in the regulation of circadian rhythms, pupillary light reflex, and other non-visu...
Melanopsin is a photopigment found in specialized photosensitive ganglion cells of the retina that are involved in the regulation of circadian rhythms, pupillary light reflex, and other non-visu...
Melatonin
Melatonin, also known chemically as N-acetyl-5-methoxytryptamine, is a naturally occurring compound found in animals, plants, and microbes.
Melatonin, also known chemically as N-acetyl-5-methoxytryptamine, is a naturally occurring compound found in animals, plants, and microbes.
N-Acetylserotonin
N-Acetylserotonin (NAS), also known as normelatonin, is a naturally occurring chemical intermediate in the endogenous production of melatonin from serotonin.
N-Acetylserotonin (NAS), also known as normelatonin, is a naturally occurring chemical intermediate in the endogenous production of melatonin from serotonin.
Nathaniel Kleitman
Nathaniel Kleitman (April 26, 1895 Chişinău – August 13, 1999) was Professor Emeritus in Physiology at the University of Chicago.
Nathaniel Kleitman (April 26, 1895 Chişinău – August 13, 1999) was Professor Emeritus in Physiology at the University of Chicago.
Night owl (person)
Night owl is a term used to describe a person who tends to stay up until late at day.
Night owl is a term used to describe a person who tends to stay up until late at day.
Nocturnality
Nocturnality is an animal behavior characterized by activity during the night and sleeping during the day.
Nocturnality is an animal behavior characterized by activity during the night and sleeping during the day.
Non-24-hour sleep-wake disorder
Non-24-hour sleep-wake syndrome (Non-24) is a chronic circadian rhythm sleep disorder, classified within Chapter VI, Diseases of the Nervous System, in the ICD-10.
Non-24-hour sleep-wake syndrome (Non-24) is a chronic circadian rhythm sleep disorder, classified within Chapter VI, Diseases of the Nervous System, in the ICD-10.
Non-24-hour sleep-wake syndrome
Non-24-hour sleep-wake syndrome (Non-24) is a chronic circadian rhythm sleep disorder, classified within Chapter VI, Diseases of the Nervous System, in the ICD-10.
Non-24-hour sleep-wake syndrome (Non-24) is a chronic circadian rhythm sleep disorder, classified within Chapter VI, Diseases of the Nervous System, in the ICD-10.
Phase response curve
A phase response curve (PRC) illustrates the relationship between the timing and the effect of a treatment designed to affect circadian rhythms.
A phase response curve (PRC) illustrates the relationship between the timing and the effect of a treatment designed to affect circadian rhythms.
Photoperiodism
Photoperiodism is the physiological reaction of organisms to the length of day or night.
Photoperiodism is the physiological reaction of organisms to the length of day or night.
Photoreceptor protein
Photoreceptors are light-sensitive proteins involved in the sensing and response to light in a variety of organisms.
Photoreceptors are light-sensitive proteins involved in the sensing and response to light in a variety of organisms.
Photosensitive ganglion cell
Photosensitive ganglion cells, also called photosensitive Retinal Ganglion Cells (pRGC), intrinsically photosensitive Retinal Ganglion Cells (ipRGC) or melanopsin-containing gangl...
Photosensitive ganglion cells, also called photosensitive Retinal Ganglion Cells (pRGC), intrinsically photosensitive Retinal Ganglion Cells (ipRGC) or melanopsin-containing gangl...
Polyphasic sleep
Polyphasic sleep, a term coined by early 20th-century psychologist J.S. Szymanski, refers to the practice of sleeping multiple times in a 24-hour period—usually more than two, in contrast to bip...
Polyphasic sleep, a term coined by early 20th-century psychologist J.S. Szymanski, refers to the practice of sleeping multiple times in a 24-hour period—usually more than two, in contrast to bip...
Retinohypothalamic tract
The retinohypothalamic tract is a photic input pathway involved in the circadian rhythms of mammals.
The retinohypothalamic tract is a photic input pathway involved in the circadian rhythms of mammals.
Roberto Refinetti
Roberto Refinetti is a behavioral physiologist, philosopher of science, and higher-education administrator.
Roberto Refinetti is a behavioral physiologist, philosopher of science, and higher-education administrator.
Russell G. Foster
Russell Grant Foster, FRS is a British professor of circadian neuroscience, currently based at Brasenose College at the University of Oxford.
Russell Grant Foster, FRS is a British professor of circadian neuroscience, currently based at Brasenose College at the University of Oxford.
Rütger Wever
Rütger Wever is a German scientist, known for his significant contributions to the field of Chronobiology, including some of the first experiments on humans in time isolated environments.
Rütger Wever is a German scientist, known for his significant contributions to the field of Chronobiology, including some of the first experiments on humans in time isolated environments.
Sara Mednick
Sara C. Mednick is a sleep researcher at the University of California, San Diego.
Sara C. Mednick is a sleep researcher at the University of California, San Diego.
Seasonal affective disorder
Seasonal affective disorder (SAD), also known as winter depression, winter blues, summer depression, summer blues, or seasonal depression, is a mood disorder ...
Seasonal affective disorder (SAD), also known as winter depression, winter blues, summer depression, summer blues, or seasonal depression, is a mood disorder ...
Segmented sleep
Segmented sleep, also known as divided sleep, bimodal sleep pattern, or interrupted sleep, is a polyphasic or biphasic sleep pattern where two or more periods of sleep are punc...
Segmented sleep, also known as divided sleep, bimodal sleep pattern, or interrupted sleep, is a polyphasic or biphasic sleep pattern where two or more periods of sleep are punc...
Shift work
Shift work is an employment practice designed to make use of, or provide service across, all 24 hours of the clock each day of the week.
Shift work is an employment practice designed to make use of, or provide service across, all 24 hours of the clock each day of the week.
Shift work sleep disorder
Shift work sleep disorder is a circadian rhythm sleep disorder characterized by insomnia and excessive sleepiness affecting people whose work hours are scheduled during the typical sleep period.
Shift work sleep disorder is a circadian rhythm sleep disorder characterized by insomnia and excessive sleepiness affecting people whose work hours are scheduled during the typical sleep period.
Sleep diary
A sleep diary is a record of an individual's sleeping and waking times with related information, usually over a period of several weeks.
A sleep diary is a record of an individual's sleeping and waking times with related information, usually over a period of several weeks.
Sleep inertia
Sleep inertia is a physiological state characterised by a decline in motor dexterity and a subjective feeling of grogginess immediately following an abrupt awakening.
Sleep inertia is a physiological state characterised by a decline in motor dexterity and a subjective feeling of grogginess immediately following an abrupt awakening.
Sleep phase chronotherapy
In chronotherapy, an attempt is made to move bedtime and rising time later and later each day, around the clock, until these times reach the number of hours of sleep per night an individual nee...
In chronotherapy, an attempt is made to move bedtime and rising time later and later each day, around the clock, until these times reach the number of hours of sleep per night an individual nee...
Spring Fever (syndrome)
Spring Fever is a term applied to several sets of physical and psychological symptoms associated with the arrival of spring.
Spring Fever is a term applied to several sets of physical and psychological symptoms associated with the arrival of spring.
Spring fever (syndrome)
Spring fever is a term applied to several sets of physical and psychological symptoms associated with the arrival of spring.
Spring fever is a term applied to several sets of physical and psychological symptoms associated with the arrival of spring.
Sundowning (dementia)
In medicine, sundowning, also known as sundown syndrome, is a syndrome involving the occurrence or increase of one or more abnormal behaviors in a circadian rhythm.
In medicine, sundowning, also known as sundown syndrome, is a syndrome involving the occurrence or increase of one or more abnormal behaviors in a circadian rhythm.
Suprachiasmatic nucleus
The suprachiasmatic nucleus or nuclei, abbreviated SCN, is a tiny region on the brain's midline, situated directly above the optic chiasm.
The suprachiasmatic nucleus or nuclei, abbreviated SCN, is a tiny region on the brain's midline, situated directly above the optic chiasm.
Ultradian
Ultradian rhythms are recurrent periods or cycles repeated throughout a 24-hour circadian day.
Ultradian rhythms are recurrent periods or cycles repeated throughout a 24-hour circadian day.
Zeitgeber
Zeitgeber (from German for "time giver," or "synchronizer") is any exogenous (external) cue that synchronizes an organism's endogenous (internal) time-keeping system (clock) to the earth's 24-ho...
Zeitgeber (from German for "time giver," or "synchronizer") is any exogenous (external) cue that synchronizes an organism's endogenous (internal) time-keeping system (clock) to the earth's 24-ho...