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Plus they take up no room when you pack. A fellow travelers asked me how I managed to travel so light, around the world in 78 days with just a backpack. When we got to our shared room I told him " room time is nude time" is part of the secret. If you aren't wearing anything for 1/4 to 1/3 of the day you don't need as much clothes
Cheap laundry services were available plus the rest of the world brushes their teeth, etc. So when my travel size toiletries run out I just the local brand. And clothes can be worn a bit more than we tend to. Over 60 some countries visited and three complete circumnavigations of the globe all done with only a backpack I bought for $1 and a small day bag . Oh and I tend to wear the minimal that is culturally appropriate whenever possible. I am comfy in shorts at temps others are cold at.
My house is not double-glazed and the temps drop below 0 Centrigrade in winter, so nude doesnt always cut it. However I hate the restrictions of T-shirts around the armpits and would definitely never wear briefs. Even tramping I slip the briefs off in the sleeping-bag, as they are so uncomfortable. I have tried extra duvets in Winter, but invariably it is comfortable going to bed, but just gets too hot in the night.
I think the secret is to dress down before bed-time, so your body does not find slipping into bed to be cooler. Also a wheat-sack at bed-time is a great help for being comfortable.
Having a hot spa before bed, helps too. Cooling down assists you get to sleep apparently. But you do need to be comfortable to start, not desperately trying to get your feet warm! Unfortunately I cannot heat my bedroom to the ideal 18 degrees C and keep it constant.
Long T-shirts, like night-gowns are 1000% more comfortable than PJ trousers, briefs or even boxers.
It is surprising that the warmer you dress, the colder you get. Your body must condition itself to the climate. My feet get freezing when I wear socks and boots to town, so I cant wait to change into jandals when I get home, so my feet can get warm.
As for getting up in the morning, I just slip on a shirt and a zip up dacron vest as soon as I get up to maintain heat up top. It has to be pretty cold to need more than that. Mostly my knees and lower back get cold if sitting at the desk, not moving much.