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The biological cycle that is approximately 24 hours long is called the circadian rhythm. It regulates various biological processes such as sleep-wake cycles, hormone production, and body temperature fluctuations. Exposure to light is a key factor in synchronizing the circadian rhythm with the external environment.
Circadian
Circadian
Each 24-hour cycle of and night is called a(n) zeitgebers!
It is called the Circadian Rhythm.
That controls sleep and wakefulness. It is the body's natural clock. It is a biological rhythm or cycle of approximately 24 hours.
circadian rhythm
A bathyphase is a time period within a cycle during which the cycle is low, especially the low part of a sine wave fitted to a measurement of a circadian pattern or another biological rhythm.
Probably your circadian rhythm prevents you. Circadian rhythm is a person's biological clock; regular bodily rhythms (for example temperature or in your example wakefullness and tiredness) that occur on a 24 hour cycle.
http://www.answers.com/topic/body-rhythm-physiology
A daily cycle is a "circadian rhythm" that's 15 letters and one space.
truh