It all depends on how far they move. It is normal for a breast to flatten out and move to the side when you lie on your back. If the implants do not move and stay very prominent when you lie down, then that is unnatural. But if they move too far to your side and that is bothersome to you, then you may ultimately benefit from having the lateral aspects of your pockets sutured closed. If so, your surgeon may want to wait until your scar tissue capsule lining the pocket is well established so that it will hold the repair properly. I have had success in patients whose pockets are unpredictably stretching too far laterally by having them wear a supportive sleep bra that holds the implants closer together when they are lying down. I have seen lateral pockets close down over a few months, and since you are so early after surgery and your pockets are not yet mature, this might be worth a try. I would suggest wearing this for a few months, and in fact I now recommend that all my augmentation patients wear a sleep bra for a few months just in case their pockets may be prone to this lateral stretching effect.