Sometimes, if you sleep on your arm for a long time, you won’t be able to control it properly for a few seconds after you wake up. Why does that happen?
In: Biology
When you sleep on your arm, you’re putting a good amount of pressure on it. This squeezes the blood vessels inside, which means the nerves and muscles get less blood than they should. They basically “fall asleep” as they shut down to preserve themselves. Once you shift your weight off the arm, the blood rushes back in, and so the nerves wake up again, which is what causes the weird tingling and pinpricks – that’s literally your nerves turning on.
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