I suspect that everyone has had an arm "fall asleep" before, and if it's positional or comes and goes with movement, it's very unlikely that it's being caused by MS. I have severe problems like that, but I attribute almost all of them to my peripheral neuropathy (HNPP and carpal tunnel, etc., etc.) instead. I just spent several months with completely numb fingertips while taking yoga, but it has finally dwindled down to just a twinge in the weeks since I stopped taking the class.
I post about the peripheral nervous system on here ad nauseum
, because the PNS consists of every nerve except
the brain and spinal cord and anything that affects them can mimic MS. http://www.thisisms.com/ftopict-8138.html
Take a deep breath and repeat after me, "It's not always MS...it's not always MS...it's not always MS..."
P.S. Here's a link to a google answer for what makes arms & legs fall asleep - not that it's the definitive explanation, just a quick one for you. http://health.howstuffworks.com/question552.htm