Waking up at the same time every morning may seem like a habit, but it is not. Even without an alarm clock, it may persist. A habit suggests that it is a conscious and voluntary action, where waking every morning at the same time is habitual but unrelated to a conscious decision to wake up.

Rather, the phenomenon is related to biological and physiological functions known as sleep timing, circadian rhythms, and sleep cycles. These not only affect when we rise in the morning but also explain why we stir routinely in the middle of the night.

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