What can I do about my horrible circulation when I sleep?

I am 40 weeks pregnant, I am not sure if this is the cause. Everynight I have to wake up about every hour because my hands go completely numb. Past the point of falling asleep. Even if I am not laying on them I have to sleep with them hanging off the bed facing down so the blood keeps flowing to them. Also, if they are up for too long they go numb, for example, me just typying on my laptop this question my left hand is already cold and tingly. What can I do to get this to go away?! It is just my hands and no where else. Please HELP!