An incredibly painful problem, im young, I eat well, I exercise between five and seven times a week so I should be healthy right?

Anyway I've had a problem when sleeping the last few nights, it's really uncomfortable and the pain is quite agonising, plus the poor sleep is making me feel like rubbish..

Anyway I'm not sure if it's a circulation problem or something but whenever I go to sleep I'll wake up after about two hours with both my hands and lower arms feeling numb, not just numb but painfully numb. last night it was like two 20 stone people were sat on each hand, I actually screamed out in agony a few times, they're still hurting now, any idea what this is? If I dont get a good night sleep soon im going to be very grumpy..