![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/3/30/Biological_clock_human.svg/640px-Biological_clock_human.svg.png&w=640&q=50)
Second wind (sleep)
Sleep phenomenon / From Wikipedia, the free encyclopedia
Dear Wikiwand AI, let's keep it short by simply answering these key questions:
Can you list the top facts and stats about Second wind (sleep)?
Summarize this article for a 10 year old
Second wind (or third wind, fourth wind, etc.), a colloquial name for the scientific term 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 when exhausted.[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 because it is the time when they would normally wake up.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/3/30/Biological_clock_human.svg/640px-Biological_clock_human.svg.png)
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".