Aiyoo I've heard a few mums mention this, kat third trimester memang banyak strange sensations sebab everything shifting and stretching! The sharp stabbing feeling kat atas tu boleh jadi ligament stretching or even baby's position causing pressure on nerves, tapi since ni sakit yang tak biasa dan affecting your sleep, better check with your gynae just to be sure everything's okay lah. In the meantime try sleeping on the right side, use a pregnancy pillow to support better, and if the pain gets worse or ada bleeding terus pergi je, better safe than sorry kan. Hang in there, not long left!