Can I sleep without a bra?

I recommend my patients wear a comfortable sports bra for 4 weeks.  After 4 weeks, they cango to their usual bra.   If the bra is underwire and uncomfortable then try a different bra.

I would definitely discuss this with your plastic surgeon first.  I do not require my patients to wear a bra to sleep after a few weeks.  I think it is important to stay away from under-wire bras after breast surgery but any sports bra or comfortable bra should be adequate.  This is something I would discuss with you surgeon, though, as he or she knows your history well.