What to do if i often wake up with my hand and arm totally numb. do i have poor circulation?

Carpal T Syndrome is: More likely your dx, as its a very common problem. Use a wrist brace throughout the day and night would help considerably in improving your symptoms. Its recommended for night time mostly, but i advise it through the day as well, as one can do most activities with it, except some. If not improving consult your pcp or an orthopod.

Numb: this is not related to poor circulation, and more likely is representative of nerve compression. Based on the area affected the problem may be coming from the neck area. I would recommend evaluation by neurologist