@Footballstar Depends on circumstances. It could be too cold, girls could be on their period, there could be privacy concerns with the people you live with, you have to be careful with curtains so the neighbours don't get a look (which is sometimes too much hassle for just a minor increase in comfort). And more.
@SW-User same here though sometimes i wear boxers if im really tired going to bed and in just boxers, but most of the time i end up taking them off in my sleep