Change position: It is common for problems to arise from sleeping position. Arms extended stretch nerves and can cause numbness, tingling. Lying on an arm can cause some superficial blockage of blood return. If it resolves quickly, likely the cause. The bulge can be a valve in the veins. Swelling on one side that persists must be checked for clot or other more serious problems.
Answered 3/29/2016
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