Yes that is possible: It is possible that you are putting pressure on the brachial plexus while sleeping on your side.But we need more information to be precise as to if the same arm is involved, and if your dead arm return to normal as day progresses and inbetween these episodes you are otherwise fine. Brachial plexus is network of nerves running from spine includes nerve roots c5toc8 and t1, runs through axila in arm.
Answered 1/6/2015
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