Julian Diaz, MD

My advice is, sleep on your back for the first 2 weeks, after this you can start laying on your side, and you should be able to sleep in any way you want after a month. 

Yes, you should wear your surgical bra for the next month. That way the implants would stay in the correct place, that is a pocket that the doctor make during the surgery. 

In my experience, patients should return exercising after one month. During the following months, you should avoid the exercise that involves arms movements. For weight lifting, three months will be ok.