Limbs going numb easily

Happens to me in my arms either from driving with one arm on the other seat back, or from the way I sleep. No real issues with the legs, mainly arms.
 
Started happening to me on the cycle I am on. I wake up in the night and my arm and/or leg are completely dead after laying funny on them. Dos not bother me, I got low BP so I believe it is from them muscles growing or chances in bloods cell ratio.
 
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