BestOfLemmy

Aside from personal preference you shouldn't sleep in the nude because encase of emergency you may need to run out to render assistance to a family member at night and you don't want to traumatized your kids or grandma. Also people shed and sweat in their sleep so unless you are changing your bed coverings every couple of days then you'll be sleeping in you own filth, with pajamas at least the contamination will be kept to a minimum.