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This clock helps regulate the "normal" awake and sleep cycles.
Different organ systems in the body recover at different rates.
Sleep is influenced by the circadian rhythms (regular body changes in mental and physical characteristics that occur in the course of about 24 hours).
These are controlled by brain neurons that respond to light, temperature and hormones and other signals and comprise the body's biological clock.
Older, school-aged children and teens need at least 9 hours of sleep a night.
Women in the first trimester of pregnancy have been observed to need a few more hours' sleep than is usual for them. Deep or slow wave sleep (Stage N3) sleep declines as we age, while light sleep (Stage N1) increases with age, so that older adults may spend less time in the more restorative stages of sleep and more time in lighter sleep.