Sleeping on your back can become uncomfortable, and many people sleep better lying on their stomachs; however, after a tummy tuck, it's important to keep tension off of the incisions and surgical site. Before sleeping on your stomach, call your plastic surgeon for guidance. Each plastic surgeon personalizes aftercare instructions to the individual patient, so it's an important part of your relationship with your surgeon to get specific instructions. You'll probably be best served by sleeping on your back or in a recliner position. When you sleep in a more upright, recliner position, your skin won't be pulled tight and the surgical area will be able to more effectively heal. Long story short, be sure to check with your surgeon before deviating from your aftercare instructions. After a few weeks, your results will be shaping up splendidly and you should be back to a much more normal routine.