I'm curious to try a bedjet (no affiliation).

https://bedjet.com

hmmm seems interesting.

I've always been a really good sleeper. The cold feet trick worked for me because I grew up in a house without central heating in Ireland. So if I woke I'd toddle to the toilet and back, by the time I did that I was properly cold. And I run quite hot so I heat up under the covers quickly. boom back to sleep.