The readon why your arms are falling asleep so easily is because of your mass. The more mass you have the easier it is to have the blood circulation cutt off. I have been living with it for a couple of years. Luckily the old man is a doc, so he went into great detail. The only thing you can do to get rid of it is to stay flexible. I don't know about you but that is really hard for me to do so I just learned to make myself sleep on my back with my arms by my side.