And if you have pets, they will find a way to step directly on your boobs. My cats like to walk across me when I'm asleep, and have a knack of stepping directly on at least one of mine... And it's not exactly a pleasant way to wake up. My neighbours probably wonder what the loud gasps and swearing are all about on the other side of the wall, at 3 AM. Lol...
When I started wearing a bra, (and a binder at work where I wasn't out to them) I didn't do it because they were big enough to warrant one, it was to keep my nipples from rubbing against my shirt.... wow was that unpleasant.
Oh, and yes, no carrying boxes against your chest anymore... carry them low.