It isn't necessary bad to wear underwear when you sleep, some people like the comfort of being totally nude and the feeling of the sheets agains they bodies.
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underwear
quilt that is because when we sleep we wear anad sleep a quilt
People wear Fruit of the Loom underwear. Soldiers usually wear fatigues.
Well, Sonic (The Hedgehog, I presume) doesn't even wear pants or underwear... So, no?
underwear, unitard (kind of leotard for ballet), underwire bra (for girls). that is three