I wear the pair I put on in the morning untill I get home from work and shower, then I put on a pair that I sleep in.
My wife usually puts on a new pair of panties each day after she showers, which, barring an accident, she'll wear all day, then will sleep in (I sleep in the boxers I've worn that day), except when she sleeps NAKED!
Why the devil do you wear panties to bed?
Except for during your period, why would you need underwear in bed?!
Sleep like you want to, I like wearing silk panties to bed.
i know my sister wears the same panties for a few days in a row. she wears baggy sweatpants around the house and her underwear is visible nearly all the time