right now the thermostat is set 68 day / 60 night, but depending on my next utility bill, I might lower that to 58 night. your observation about the way they sleep is good...I was guessing same. they're all curled up into little balls at night, although Rocket usually sleeps during the day all sprawled out in any old position. I have the heating pads on medium. I can feel the warmth through the foam and fleece of the bed, but it's not hot. but the beds aren't enclosed, so it's only warm on the surface. I guess if yours are comfortable that cold, mine are probably all right.