Is it normal to wear a bra to sleep?
Depends.It depends
Yes, it’s normal to wear a bra to sleep, and it’s also normal not to. Go with whatever feels comfortable; a bra isn’t medically necessary for sleep for most people.
Some people like the extra support, especially if their breasts feel tender or they’re used to wearing a bra all day. Others find bras too restrictive and are happier taking them off at bedtime. Both preferences are common.
If you do sleep in one, choose a comfortable fit without anything digging in or rubbing. There’s no need to wear one to prevent sagging, and sleeping without one is fine too.