Why do people twitch in their sleep? At what sleep stage does this happen?

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This is usually the giveaway as to whether someone has entered some form of sleep, rather than just resting with eyes closed. What sets off the random, brief and occasional twitches?

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Anonymous 0 Comments

Anecdotal evidence here, but I notice that this happens to me only when I am stressed or sleeping untimely. This is when I have a clenched fist or a raised leg or some other tensed muscle. I have attributed the twitch sensation to my muscles suddenly relaxing due to onset of sleep and my brain interpreting it as falling off a tree.

I never get this twitch when I make sure to relax myself before I sleep

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