So long as you dont sleep on your tummy and therefore on your forms, nothing is going to happen to them.
Except on hot Australian summer nights, I sleep with my C cup forms in a lacy underwire bra, with matching panties and a cami. In winter over the above I wear soft floral fleecy pj’s, on warmer nights a silk nightie
On overnight away trips, I attach my double sided tape forms to my chest and leave them on until its time to pack up and check out.
Sometimes I’m away two nights and my “PB” is circa 40hours “with my own boobs”.