As I’ve mentioned a few times, I get chilled and I love heated towels. As Anthony has it figured, 6 minutes in the dryer gets them just right and they hold the heat long enough. I put one under me and one on top of me, then pull up the covers.
And an hour later I’m awake and flinging things off of me because I’m so hot. But it is wonderful to go to sleep so toasty warm.