Eh, ni very normal lah sis, especially at 36 weeks! A few of us went through the same thing, tangan kebas bila bangun or tengah tidur sebab uterus dah besar and pressure on nerves, plus hormone changes jugak yang bikin fluid retention. Try to adjust your sleeping position, maybe guna extra pillow to support your arms, and jangan tido atas tangan tu lama sangat, morning stretches and gentle hand movements boleh tolong jugak. But since this is your first baby and you want peace of mind, check with your doctor during your next appointment eh, just to make sure semua okay!