too hot then too cold

Nate told me that sometimes he gets really hot but it never lasts long. He gets cold in a very short time after that.
It makes ya wonder if his body temp is trying to regulate itself or its just still messed up.
I hate to think how he will do when it gets down to 32 at night like it did last year.
We’re in a small wind protected valley here so it gets pretty cold at night.
Good thing for forced air heating.