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When having tingling or numbness in an extremity upon awakening, it is usually due to pressure on one or more of the nerves that serve the extremity. After you get up and relieve the pressure, then the nerve will gradually resume functioning, although the time until function returns will vary depending upon the amount and duration of pressure on the nerve.
If it is happening more frequently, then it is reasonable to ask your doctor whether there is any condition that would increase the risk of this happening, such as an underlying nerve disorder or musculoskeletal conditions that cause swelling along the course of the nerve and increase the likelihood of pressure on the nerve.
It is also important to note that there are also non-medical reasons why this may be happening more often, such as a mattress that is old.
Yes, the first step would be to see your GP and mention the symptoms that you are experiencing.
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