Being someone that has Neuropathy in his feet I can proably answer your questions. 1st off, if you have Neuropathy, it doesn't come and go. It can often be a spot or an area that tingles or goes numb. More often it is severe pain in an area for some time before the numbness sets in (thats the nerves actually dying). What it sounds like you have, is a reaction from knowingly or unknowingly sleeping on your arm. If the tingling were constant, in the same place and didn't go away, I'd say you were a candidate for Neuropathy.
However, one more thing. With Diabetics, the most common place for Neuropathy to start is in the feet and legs, not in the arms. Im not saying it couldn't start in the arms, but that is a much much rarer occurance. If your blood sugar numbers are in the ranges they should be, you can most probably rule out neuropathy. I'd keep doing what youre doing and not really worry about it unless the symptoms become more pronounced.