Possible tiny house bed solution
Dhp 8-Inch Independently-Encased Coil Premium Futon Mattress, Full Size, Black #DHP
Mozaic Dual Memory Foam Futon Mattress, Full, Ivory -- More info could be found at the image url.
Twin Size Khaki Futon Mattress (12-inch), Tan
Kaiya Cotton and Foam Futon Mattress
Albany Futon with storage in Rustic Walnut Finish, Multiple Suede Colors, Blue