The only time I ever wore a bra to bed was when I was breast-feeding my babies. It provided some support that felt good for that situation.

But otherwise, I agree with missbelle. So much more comfortable to not wear a bra except when absolutely necessary! (I bet bras were invented by men)

Have you asked your friends why they wear one to bed? If they believe it will keep their breasts from sagging later in life... nothing stops gravity!

Plus, do you really want to wake up with the impressions left on your body from the bra?