Left hand has been numb for about two days and is hard to move fingers around. Not sure what might be wrong?

Two days ago i had woke up with my arm numb and it was hard to move my fingers around. It has gotten a little better but i still can't fully move my fingers or hand. There is no pain just numbness. I think i slept on it wrong or something. Not sure if i should take it serious or not. Tried moving it around and massaging it out but it doesn't help. I'm thinking it may be a nerve damage somewhere in my arm or hand.