I wasn't aware that this was a thing that happened. I use a hot water bottle now — the typical flexible rubber one, encased in a little wooly jumper. I typicall

I wasn't aware that this was a thing that happened. I use a hot water bottle now — the typical flexible rubber one, encased in a little wooly jumper. I typically go to bed around 01:30 with the hot water bottle under the covers near my feet, and it's still warm around noon. I'm getting at least 12 hours of warmth from mine each night.