Since it’s the summer and temperatures are hot in the south, I’ll sleep in either 19 or 20. During the winter, I’ll wear 3 or 4 (Boys boxers are comfy to me lol). As a mom, If I’m wearing 19 or 20 I’ll usually keep a cotton tee on standby in case my preteen son knocks on my door in the middle of the night. I also love wearing silk nightgowns in the winter, but obviously it’s not listed.
As a scandinavian who have spent many nights in Texas, I don’t think I’ve ever worn anything else than 20 while sleeping. Too warm, hotel windows don’t open (why??) and the bedding is too layered.