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Second wind (sleep)
Second wind (or third wind, fourth wind, etc.), also occasionally referred to as the wake maintenance zone, 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.〔''(Sleep Hygiene )''. Queendom.com〕〔http://www.parentsconnect.com/questions/weissbluth-sleep-second-wind.jhtml〕〔(【引用サイトリンク】title=Principles and Practice of Pediatric Sleep Medicine )〕 They are the result of circadian rhythms cycling into a phase of wakefulness. For example, many people experience the effects of a second wind in the early morning even after an entire night without sleep because it is the time when they would normally wake up.
While most "winds" coincide with the 24-hour cycle, those experiencing extended sleep deprivation over multiple days have been known to experience a fifth day turning point. (See "Fifth day turning point")
==Characteristics==
The "second wind" phenomenon may have evolved as a survival mechanism as part of the fight or flight response, allowing sleep-deprived individuals briefly to function at a higher level than they would without more sleep.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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