for some reason I can only sleep on my right side. I find on my left it aches my hips but on my right I can pass out in a matter of seconds! everyone's different, but do what works best for you. I use to sleep on my stomach but that's no longer possible because if I even try to now I'll hurt my back.
asked my midwife and she said...you're pregnant sleep how you can get comfortable...if you're the rare person who can't sleep on their back due to blood flow issues for baby, your body lets you know before it's an issue, you get light headed dizzy and nauseous.