Me, most nights: My feet feel warm enough, so I don't need to turn on my foot warmer (heating pad).

I turn it on anyway.

Also me most nights: I HAD NO IDEA MY FEET WERE SO COLD! I LOVE YOU, FOOT WARMER!

And that's why I always turn on my foot warmer. There will always be many cool spots in bed, and I don't always know I need that hot spot until I use it.

Cold feet prevent me from falling asleep, so this helps with one aspect of my insomnia.