Electric blankets do a good job too
I refuse to sleep in any bed with an electric blanket, and prefer to get into a cold bed.
Why?
Because when I was a kid, we had one catch fire in my room. I can still vividly remember the smell of smouldering mattress as my dad dragged it out onto the drive in the dark.
The mother-in-law once innocently set one up in a bed we were sleeping in at her house, never told us, and left it on all night. I woke in the early hours drenched in sweat thinking I was dying. When we discovered the blanket turned on I nearly had a fit! I had to gently explain why to her over brekkie the next morning…… 😕