No. Not after the healing phase approx. 3 months and with subpectoral - under the muscle- placement as I use for my breast cancer patients... Cosmetic augmentation patients -- under the breast-- slightly less time. A stiff shoulder with the mastectomy patients is more of a problem. Most of my surgery patients sleep in a lounge chair 30 degrees upright for 2 weeks.
Early on. But as time goes on it is better. Get a good mattress.
Sleeping implants. You'll be surprised how little time passes before your implants feel like they are part of your body. If you are a stomach sleeper you should put a small pillow under and above your breasts for the first few months to keep the pressure off of them. Breast augmentation is not really a contraindication to sleeping on your stomach.
It is different. Unlike natural breast tissue, saline implants do not flatten and move to the side as readily. Consequently, there may always be a feeling of an object between the chest and the mattress. This is, however, not a major complaint from most women who have breast implants.
Breast. I do 4 breast reconstruction a week some implants some trams, the first 4-6 weeks you will not want to lay on your stomach, now gels feel natural you can lay on them as soon as two weeks saline are firmer and may take longer.