what you're experiencing is "sleep twich" or "hypnic jerk". it is the involuntary twitch that occurs as you fall into deep sleep. physically it ressembles the jump or the fall and it occurs with people who have sleeping disorders, or haven't been getting enough sleep, or when your body is very tired. all you need to do is fix your sleeping schedule.
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It is recommended that all individuals see a Family Doctor for a full medical examination annually. Adults should get their blood pressure checked (US Preventive Task Force), a flu vaccine (CDC) and more each year.