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Biological: Behavioural genetics · Evolutionary psychology · Neuroanatomy · Neurochemistry · Neuroendocrinology · Neuroscience · Psychoneuroimmunology · Physiological Psychology · Psychopharmacology (Index, Outline)
Variations in the timing and duration of biological activity (eg eating, sleeping, mating, hibernating, migration, cellular regeneration, etc), occur in both animals and man.
See also
- Chronobiology
- Circadian rhythm a roughly 24 hour cycle
- Infradian rhythms, which are long-term cycles, such as the annual migration or reproduction cycles found in certain animals or the human menstrual cycle.
- Ultradian rhythms, which are short cycles, such as the 90-minute REM cycle, the 4-hour nasal cycle, or the 3-hour cycle of growth hormone production. They have periods of less than 24 hours.
- Tidal rhythms,
- Lunar synodic cycle
- Seasonal variations
- Sleep wake cycle]