i sleep on my iphone all the time its no problem. your body and mattress act as cushions. and if you have a carpet floor it will bounce off that if it falls off the bed.
the only way you most likely will crack it is when the iphone alarm rings and you pick up the phone to press the silent button then u drop it back onto the nightstand and fall back to sleep
the only way you most likely will crack it is when the iphone alarm rings and you pick up the phone to press the silent button then u drop it back onto the nightstand and fall back to sleep