I'd like to know how did people, especially males, used to dress while sleeping in the Middle Ages in Europe.
I suppose the nightwear changes both according to the exact time period and to where in Europe (mostly because of the different climate, but culture might be another factor).
Why I'm wondering about this:
I know something about day dresses because of medieval fairs but at night I can only imagine tunics and maybe some form of underwear? I got told underwear did not exist at the time but I'm not sure Christianity would have allowed people to sleep together with nothing under the tunic.
Were night trousers, such as in modern pajamas, a thing?
A note if too broad:
If differences are really great, the tendencies for the middle-upper class (not poor, not noble) around the end of the Middle Ages period in Christian central and northwestern Europe (Germany, France, England) interest me more.