Most #cats I've had don't like to be under blankets. They would go under furniture, but that was more like a cave. The box thing, feeling walls around a few sides for security.
But this one will actively dig under blankets and sheets. It's not a temperature thing. She just seems to like to burrow.
I'm sick today, and have a furry buddy snoozing with me. Kind of nice and makes the sick more bearable.