IKEA - HEMNES, Day-bed w 3 drawers/2 mattresses, white/Malfors medium firm, , Four functions - sofa, single bed, double bed and storage solution.You will get all-over support and comfort with the resilient foam mattress.
I like this. Center a rod attached to the ceiling and aligned with the middle of the mattress. Hang and drape a measurably long length of fabric into a canopy. It gives a tent effect. Kids love that. Plus, you can add and remove on a whim.