The reason they tell you to sleep sitting up is to avoid fluid buildup, stretching your incisions if you lay flat you’ll pull on them, and it protects displacing your implants ( so the don’t fall under your armpits) I’m always sleeping on my belly but for the first 2 weeks I uncomfortably slept sitting up the started sleeping on my side for another. 2 weeks. It was so frustrating and irritating but It’s worth it girls … Think of your results!