So, for your particular winter activity, what do you wear on your head when active and when at rest when the mercury drops below 0 °C/ 32 °F or much colder?
I wear a wool hat/fleece neck gaiter combo (no jacket hoods), which serves me well, especially when active (ski touring, chores around camp). However, the hat doesn't really work too well for me at night, as I seem to knock it off/take it off unknowingly whilst asleep.
I'd prefer to keep it on to conserve precious body heat, but it's kinda difficult to control what I do when unconscious. I suppose a balaclava would be the answer, but that would be just one more piece of gear to take along, and I wouldn't really use it during the day.
I know it seems like a silly topic for discussion, but I am curious as to what others do to keep their heads warm...