I voted every night, but on occasion (when the GF comes over) I sleep on the pull out bed. That is on occasion also as sometimes I still sleep in the hammock. We have an what some call an odd relationship, I call it perfect. I spend some time out of town also, so if the hotel/room has nothing to hang my hammock to, I end up sleeping on the bed. But the hammock goes just in case.
So I think that qualifies more for every night rather than on occasion. Should have made an option for On occasion, special occasions, I have to sleep on a bed.