I had one of these. It sucked because it did get warm over time & you had to keep turning it over & got warmer the longer you used it during the night.
As mentioned in the other thread, the Chillow and poop-measuring health toilets have been around for a long time, as have stream-based urinal games. Work has to be done on each to make them viable commonplace items, but I'm not sure the patents are still up for grabs.
Yeah, the Chillow is already a thing too, although it's a cooling pad rather than an actual cooled pillow.