Dumb question... what are the dimensions of the mattress for an Arm's Reach? My husband built us a co-sleeper, designed specifically to fit the futon sold by Ecobaby for some other commercial brand. It was something like 18"x32" (I don't remember exactly.) I made sheets like a tight pillowcase, so I could flip the whole thing over if I wanted to rather than wash it. And, I did frequently - considering Talia slept right in the bed with me most of the time, and the most dirt those sheets saw was cat hair from one of our cats who took up residence

Figured there was no reason to wash it for cat hair, when I could just flip it over. It also prevented the sheet from ever coming loose.