I'm 25 weeks pregnant, and I know I'm not supposed to lie on my back (I actually fainted and had a short seizure during my 20 week scan, from lying on my back too long). So I go to sleep on my side, but more often than not I wake up later on my back. Am I risking cutting off blood supply and nutrients to the baby? DH is terrified after the scan, and very keen for me to not be on my back! Would my body wake itself up if I was in danger of fainting/seizing again? Is there a way I could restrain myself and stay on my side (short of strapping me to the bed..)?