The fact that most people sleep almost exactly the same amount each day under free-running conditions,despite large day-to-day variations in physical and mental activity,provides strong support for the dominance of

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The fact that people sleep almost the same amount each day despite variations in activity suggests that sleep is primarily regulated by circadian factors (internal biological clock) rather than recuperative factors (need for restoration after activity) or external factors such as light cycles or temperature.

The Fact That Most People Sleep Almost Exactly the Same