Apparently the weight of uterus plus baby presses on one of the major veins that returns blood to the heart, which can result in dizzyness or light headedness and reduce the blood flow to the baby.
Personally I find it hellishly uncomfortable and find myself needing to shift positions after quite a short period, so it's almost like my body is programmed to prevent me from doing it in the first place.
ive been able to still lay on my back up until now - i can only manage a couple of minutes on my back until it hurts.
i was never told by anyone not to lay on my back - my doc said whatever is comfy for you
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