# what makes your arm fall asleep?

**URL:** <https://boards.straightdope.com/t/what-makes-your-arm-fall-asleep/364022>\
**Category:** Factual Questions\
**Created:** [July 11, 2006, 2:17pm UTC](https://boards.straightdope.com/t/what-makes-your-arm-fall-asleep/364022 "2006-07-11T14:17:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![shizaru](https://avatars.discourse-cdn.com/v4/letter/s/9d8465/32.png) [@shizaru](https://boards.straightdope.com/u/shizaru)\
**Post date:** [July 11, 2006, 2:17pm UTC](https://boards.straightdope.com/t/what-makes-your-arm-fall-asleep/364022/1 "2006-07-11T14:17:49Z")

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What exactly makes your arm or leg fall asleep? I’ve always wondered that. I’ve got a damaged nerve in my upper spine that cause my left arm to go numb and fall asleep at odd moments. But even before that injury I’ve wanted to know that.

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**Author:** ![Celyn](https://avatars.discourse-cdn.com/v4/letter/c/9dc877/32.png) [@Celyn](https://boards.straightdope.com/u/Celyn)\
**Post date:** [July 11, 2006, 5:13pm UTC](https://boards.straightdope.com/t/what-makes-your-arm-fall-asleep/364022/2 "2006-07-11T17:13:57Z")

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Interruption of blood supply to the relevant nerves, I believe.

[http://www.madsci.org/posts/archives/dec96/850996021.Ns.r.html](http://www.madsci.org/posts/archives/dec96/850996021.Ns.r.html)