how to sleep

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My posture is shit. It gets a lot better when I exercise and stretch properly, but one thing that's always bothered me is what to do with the shoulder I'm laying on.

I can only fall asleep on my side, and the bottom shoulder rolls out in front, letting that scapula stick out in a stupid direction.

If I use more pillows, my neck hurts in the morning. If I try to keep my shoulder where it should be, it just goes back to how it was before as soon as I fall asleep.

So, basically, what do you do with your bottom arm when you sleep on your side? Do you put your hand under your pillow or stick it out in front of you? Is it totally normal for your bottom should to come out to the front, stretching your back muscles?