Numbness & Muscle Twitching in left Hand

From past 4-5 days, I was feeling twitching in my left hand biscep muscle very aggresively just like a heart beat which felt only around bed time while resting and continued for 30-40 mins and then today at mid night at around 4 a.m. I felt uncomfortable and woke up and was felling little numbness (no pain) in left hand (specially forehand area). I was feeling like I have less strenght in my left hand though I could move my hand as I wish but there is some numbness I was feeling. I have a habbit of sleeping on my hand because of which sometimes I had experienced full blood cloth like situation when I woke up and found that for some good 30-40 seconds I had lost my full control over my entire hand (from shoulder to finger) and then as blood start flowing again from shoulder towards finger, I slowly gain control over my hand. That time I can feel blood movement and my brain gaining control over my hand again. Is this normal? Can you please help on my issue. Any advise please.