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the circadian rhythm
The human body has a 24 hour circadian rhythm.The Earth's oceans have tides that occur every day.They aren't scientifically connected to each other in any known way(s), though many people say tides and weather affect sleep patterns and enhance or disrupt the body's circadian rhythm.
It does not significantly affect the circadian rhythm.
The body's natural "down time"
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circadian rhythm
Each 24-hour cycle of and night is called a(n) zeitgebers!
hypothalamus
Circadian rhythm sleep disorder is a disorder that affects the timing of sleep. People with this disorder typically have issues waking up by alarm clock but can sleep and wake when they wake by their body clock. You can get more information about this disorder at the Wikipedia.
That controls sleep and wakefulness. It is the body's natural clock. It is a biological rhythm or cycle of approximately 24 hours.
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.
Jet lag refers to the adjustment that the body must got through to recover from the interruption in the circadian rhythm which governs our sleep patterns. This usually occurs after a long commercial flight.