Position your arm on a pillow in a neutral position while you're sleeping. Look up some median nerve glides on Google and do those 2-3 times a day. Wearing those wrist bands now may be a good idea during the day rather than waiting till it gets worse.
I got pregnancy induced carpel tunnel with my first! It was awful and I had to wear braces on my wrists at night! Talk to ur doc they maybe able to recommend something!
It sounds like it could also be poor circulation. I would mention it I your doctor.
Do u have carpal tunnel..?.. if u do it gets worse during pregnancy