It's called a myoclonic jerk, it's very common when you're falling asleep. Respiration rate falls, and the brain interprets this as the body dying, so it sends a pulse to wake it up.
His leg twitched. I don't see what!
That twitch in your leg. Did you feel that? Didn't hurt.
That twitch in your leg. Did you feel that? Didn't hurt. [SEP] His leg twitched. I don't see what! [SEP] It's called a myoclonic jerk, it's very common when you're falling asleep. Respiration rate falls, and the brain interprets this as the body dying, so it sends a pulse to wake it up.