Upsetting news, friends: if you don’t want the girls to sag, then you’ll have to tuck them up before you tuck yourself in. It’s sad but true: Sleeping sans bra is the major cause of breast droop. Gravity works at night too. Size matters, too. The larger your breasts are—whether due to genes, implants or pregnancy—the more they’ll droop. A and B cups needn’t worry too much, while those with Cs and up should make a habit of sleeping with support. There’s no evidence that sleeping in a bra has any negative consequences beyond a pinch or a poke here and there, so just make sure to find something comfy like a sports bra or a cami with a built-in.
MORE: Ask A Scientist: Should I Sleep in a Bra?