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What causes pins and needles when your leg falls asleep?
When your leg falls asleep, it’s because you’ve put pressure on a nerve, which blocks its ability to send signals to your brain[1][6]. Once you move and release that pressure, the nerves suddenly reboot and fire off a flood of disorganized signals, which your brain interprets as that classic pins and needles sensation[2][5].
Commonly, people think this is just about blood flow, but it’s actually a mix of both nerve compression and restricted blood supply[5]. Did you know that hitting your funny bone is actually just you smacking your ulnar nerve[1]?
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