I allow my breast augmentation patients to sleep in any position they desire. I have not noticed any issues or problems with their breast implants due to sleeping position. I do have my patients wear a supportive bra that we provide day and night for one month.Definitely check with your plastic surgeon to get his/her advice.
Congratulations on having undergone the breast augmentation procedure. Your plastic surgeron will always be your best resource when it comes to specifics. In my practice, at this stage, patients are able to sleep on their sides assuming they are doing well and they are using a supportive bra. Most patients feel comfortable lying on their abdomens approximate three months after breast augmentation surgery. I hope this helps.