Simple question really.
If you sleep in your in underwear, when do you put on a fresh pair?
Right before bed, sleep in a fresh pair and wear them the next day?
Or do you sleep in the underwear you've been wearing that day and put on a fresh pair in the morning?

If you sleep in your in underwear, when do you put on a fresh pair?
Right before bed, sleep in a fresh pair and wear them the next day?
Or do you sleep in the underwear you've been wearing that day and put on a fresh pair in the morning?