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It is the circadian rhythm that determines the ideal timing of a correctly structured and restorative sleep episode.
en.wikipedia.org Melatonin has been shown to accelerate the adaptation of the circadian system to a night work schedule.
en.wikipedia.org When one is acclimated to spending many hours "awake" in bed, it can disrupt the body's natural set of daily cycles, called the circadian rhythm.
en.wikipedia.org This system allowed an exquisitely precise circadian rhythm of luminescence to be measured from cell populations and even from single cyanobacterial cells.
en.wikipedia.org This has prompted researchers to speculate involvement, or dysfunction of the brain's hypothalamus, which controls the body's biological clock and circadian rhythm.
en.wikipedia.org