. My daughter is very modest(she's 11), would never in a million years think of sleeping naked, and my son(9) notsomuch. He walks out of the shower and into his room with the towel flung over his shoulder. He doesn't care. But he's never shown any interest in sleeping naked. I would make him throw on a pair of underwear at least.
I never sleep naked. Last night my son came to get me at 4am because he had a bad dream. I don't want him seeing me naked and he sure as heck doesn't want to see his MOM naked.

Even before we had kids though, we almost always slept clothed. It feels weird to me to not have clothes on to sleep. I don't like it at all.
Right now, my kids are next to me in their PJs-my son in flannel PJ pants and no shirt(it is currently 79 degrees in my house, I have no idea why he is wearing flannel pants.), but more often in the summer it is his underwear and no shirt, or lightweight PJ pants or athletic type shorts, no shirt.
Winter he wears as much as possible, stuff like fleece PJs or flannel pants and a long sleeved shirt..he's always cold.
My daughter is wearing soffe shorts and a tank top. Pretty much her uniform year round, t-shirts more often than tanks though. She's always hot, so rarely wears warm PJs.