@Bernarda9
Bernardo, I understand your guest has long gone but hey, I have your solution.....100%!
Buy a pair of size 30 mens underpants, cut the 'pant' section off just leaving the elastic top section, explain to the offending guest the issue, assure him the article has not been previously worn, it is new and ask him to slip the elastic section on his head and under his chin on retiring for the evening!
Yeah, go on laugh.....but it will work and everyone will get a peaceful nights sleep.
I know because a few years ago when I put on some weight the strategy was forced on me. Fortunately I have lost weight since then and the need has disappeared but, Ade said that was a time in her life she really appreciated mens underwear!
Cheers........Rob