If you place your weight on one part of your body, the applied pressure will compromise blood flow to that part, so when you wake it feels numb because the blood is not circulating properly there and so the nerves are partially deprived of blood supply. When you remove the weight of your body off your arm, the blood takes some time to return to normal and with it the normal sensation/function of your arm.
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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.