It is common for most women to have problems getting comfortable during pregnancy so her are some of the best sleep positions during pregnancy.
DO not sleep on your back. This can cause your back to hurt a lot! Sleeping on the Right or the Left side is the best. Tuck the pillow between the legs so your spine is not suffering. Do not sleep on the soft bad, but on the firm. Soft bad will make your spine shift, again causing your back to be painful.
There are many ways you can get comfortable and click here to read the full article on sleep during pregnancy.
And guess what. If you really miss sleeping on your stomach, I have a solution. Well it will not be really sleeping position during pregnancy, but it will take the strain of your back. Head over and get a prenatal massage.