chronobiology
Body clock research
Chronobiology is the study of biological rhythms—the cyclical patterns that govern living organisms.
These include circadian rhythms (roughly 24-hour cycles of sleep and wakefulness), seasonal rhythms affecting reproduction and migration, and shorter cycles like heartbeat.
The field examines how internal biological clocks synchronize with external cues like light and temperature: Chronobiology research has transformed our understanding of jet lag and shift work.
Daily biological cycle
- biological clockInnate cycle regulator
- periodicityRecurring at regular intervals
- oscillationRepeated back-and-forth movement
- entrainmentRhythmic systems aligning naturally
phase shift · endogenous · free-running · amplitude · nadir · desynchronization · pacemaker · biorhythm
Circadian rhythm regulator
- insomniaPersistent inability to rest
- REMAcronym for dreaming phase
- NREMSleep lacking eye movement
- somnolenceAbnormal urge to doze
hypersomnia · sleep-wake cycle · drowsiness · sleep debt · chronotype · lark · owl · polyphasic
Recurring patterns across seasons
- diurnalActive during daylight
- nocturnalActive during darkness
- crepuscularRelating to dusk
- hibernationProlonged winter dormancy
migration · light sensitivity · dark period · solstice · equinox · seasonal affective disorder
Circadian rhythm regulator
- cortisolAdrenal steroid regulating stress
- growth hormonePituitary signal for development
- prolactinMilk-production hormone
- testosteroneChief male sex hormone
insulin · leptin · ghrelin · thyroid hormones
Longitudinal time region
- long-haulCovering great distances
- eastwardToward the sunrise
- westwardToward the sunset
- resetRestore to original state
adaptation · recovery · light therapy · shift work · flight · adjustment period · light exposure
Melatonin-secreting brain structure
- retinaLight-sensing tissue layer
- hypothalamusSubthalamic regulatory brain region
- photoreceptorsCells sensing light
- master clockAuthoritative time source
circadian
Daily biological cycle
- biological clockInnate cycle regulator
- periodicityRecurring at regular intervals
- oscillationRepeated back-and-forth movement
entrainment · phase shift · endogenous · free-running · amplitude · nadir · desynchronization · pacemaker · biorhythm
melatonin
Circadian rhythm regulator
somnolence · hypersomnia · sleep-wake cycle · drowsiness · sleep debt · chronotype · lark · owl · polyphasic · monophasic
seasonal rhythms
Recurring patterns across seasons
- diurnalActive during daylight
- nocturnalActive during darkness
- crepuscularRelating to dusk
hibernation · migration · light sensitivity · dark period · solstice · equinox · seasonal affective disorder
melatonin
Circadian rhythm regulator
- cortisolAdrenal steroid regulating stress
- growth hormonePituitary signal for development
- prolactinMilk-production hormone
testosterone · insulin · leptin · ghrelin · thyroid hormones
timezone
Longitudinal time region
reset · adaptation · recovery · light therapy · shift work · flight · adjustment period · light exposure
pineal gland
Melatonin-secreting brain structure
- retinaLight-sensing tissue layer
- hypothalamusSubthalamic regulatory brain region
- photoreceptorsCells sensing light
chronic, biology, synchronize, biologist, chronology, synchrony, chronological, chronometer, synchronization