Sleeping During Pregnancy –
Were women created with the intention of them sleeping on their left side at all times during pregnancy? Of course not, it may be helpful to lie on your left side during labor if your baby is in distress but a healthy baby will not be affected by waking up on your back or right side. Most pregnancy books will tell you it is imperative that you always sleep on your left side. This is based on the anatomical fact that your Aorta, which is the main oxygen-supplying blood vessel of your body, is located slightly to the right of midline. By lying on your left side you may prevent decreased blood flow to the uterus.
It is much more important to get adequate rest then to worry about what side you wake up on in the morning.