"Wearing underwear at night?"- If yes, Y? If no, Y?

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In my real life discussions with my friends, i came to know that some wear underwear while sleeping at night, there were no specific reasons behind it and some living at cold places said they wear it to get protected from cold. Some or even most said, they dont wear underwear at night (some said they even wear nothing), main Reason behind it was the comfortableness and not wearing underpants does not cause any confession or compactness and lets u to sleep freely. Guys or girls, Wat about u? Do wear underwear/Panties at night while sleeping? If yes, then why with good reason? If No, then too why with good reason? (I am not taking about naked sleeping, just without panties, u can be wearing pants or tracksuit or night dress.., BUT U can also express about naked sleeping !)