Hey dear you can sleep on back for 5 minutes there's no harm but sleeping on sides is good n preferably left side as it increases blood flow to the fetus...

Hi<br> Sleeping on your left side is preferable yet you can swap sides, not on your back.

Hey dear yes it not right sleep on back however comfortable it is coz it reduces the blood flow and oxygen supply to the baby and also will increase pressure of the growing uterus and baby on ur back. I had the same issue so using a C shaped pregnancy pillow which supports my back and also legs. If not use normal pillows between your legs and at the back for support.

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