Laying on back?????

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I'm 27 weeks. I plan to ask my dr on Wednesday when I go. But I wake up on my back every time at night. I haven4 different pregnancy pillows and none of them prevent it. I feel fine no short of breath etc. And hes kicking away. But does it in some way harm him? I cant control much of what I do when I'm asleep. I could sleep on the couch if I had to, there's really no way to roll on there. Anyones dr tell them any info??