Is it normal to sleep with knickers on?
Yep.Totally normal
Yes, it’s completely normal to sleep in underwear. Some people find it comfortable, while others prefer pajamas or nothing at all.
There’s no right way to sleep: wear whatever feels comfortable to you. Lots of people sleep in knickers, and lots of people don’t.
If you like wearing them, that’s all there is to it. Breathable underwear can feel more comfortable overnight, but it’s a preference, not a rule.