Why do my arms, hands and feet always fall asleep.i know i have nerve damage?

Possible nerve injur: You may have some early carpal tunnel syndrome when you sleep sometimes the nerve gets pinched and causes some numbness and tingling in your fingers. The foot numbness may be another story.

Back Pathology: A condition affecting back can cause that feeling in hand and feet: common while trying to sleep. May be from various other conditions. Consult with your physician.

Yes, it : Appears you have some form of neuropathy. This is a problem with the nerves not necessarily nerve damage. Rather, pathology of the nerves. The question is why? See a doctor, to help find the etiology.