Well they say if your BB hurt you can wear a sports bra as you sleep to try and help so that is placing pressure on them too, definately not as much as sleeping on your stomach but definately check with a dr or ob or the like if you are really worried. I never sleep on my stomach I used to not be able to breath but since being preg I've found I've started to find it more comfortable so I dunno... sorry I couldn't be more help :-(