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Why is it so difficult to fall asleep when you are overtired? | Popular Science

https://www.popsci.com/scitech/article/2003-01/why-it-so-difficult-fall-asleep-when-you-are-overtired/

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Why is it so difficult to fall asleep when you are overtired? | Popular Science
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    Why is it so difficult to fall asleep when you are overtired?

    It's possible to feel “tired” physically and still be unable to fall asleep.

    January 23, 2003

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