It depends on how comfortable you want to be, yet alone how heavy I guess (there must be a weight limit on the pop top beds). I personally can't stand sleeping next to someone if I have to sleep like I'm in a coffin with my arms on my chest. We once had to share the downstairs bed and it was more comfortable to top and tail, at least I wasn't totally tempted to gnaw my arms off! We don't even sleep together in the van. She is downstairs, I am upstairs.