Everyone experiences that. Your body has a natural defense in which it will, for lack of a better term, jump start itself when it feels as though it may be dying. When you are falling asleep and losing consciousness your heart rate slows and periodically, your brain will become confused and will signal to your muscles "jump" all at once. Because you're already half asleep, you interpret that sensation as falling...or landing after the fall.
Is it normal when I start to fall asleep...
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Everyone experiences that. Your body has a natural defense in which it will, for lack of a better term, jump start itself when it feels as though it may be dying. When you are falling asleep and losing consciousness your heart rate slows and periodically, your brain will become confused and will signal to your muscles "jump" all at once. Because you're already half asleep, you interpret that sensation as falling...or landing after the fall.
It is totally normal.