Please look at the pinned topic that says "Sex life .."something like that. It will answer your question.
It says
QUOTE
Supposedly, wearing bras to sleep gives you the chance of getting breast cancer (yeah what doesn't?). However, wearing bras to sleep will ENSURE the great risk of you getting veins on your boobies when you get older. (And crossing your legs will pop veins giving you ugly legs when your older, too.)
or maybe it doesn't answer your question ..