The always-cold pillow is no longer a fever dream
 

The cold side of the pillow is one of life's oddly satisfying phenomena. But no sooner have you felt its gratifying chill caress your cheek than it vanishes. The cold side of the pillow could be more than just a pleasant sensation for your conscious...

https://www.engadget.com/2017/09/13/...ng-pillow-pad/