Do you play a lot of computer games or x box games?
repetitive motion things??
sitting for long stretches of time with bad posture???

Sometimes those activities can cause symptoms in your arms- the nerves or blood flow can get affected by the static postures. { not a lot of movement to keep things flowing like they should.}


sleeping with arms in certain positions can make your arms go numb.
a certain % of people will lose the blood flow to the arms when arms are above the head.