Second wind (sleep)

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Second wind (or third wind, fourth wind, etc.) is a sleep phenomenon in which a person, after a prolonged period of staying awake, temporarily ceases to feel drowsy, often making it difficult to fall asleep once it happens.[1][2] They are the result of circadian rhythms cycling into a phase of wakefulness.[3] For example, many people experience the effects of a second wind in the early morning even after an entire night without sleep due it being the time when they would normally wake up.

One can avoid "getting a second wind" by practicing proper sleep hygiene.[1]

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