They’re called “MITTZON”, made for offices. Also great room separators. I’ve tested them for a few nights and they work surprisingly well.
Otherwise making sure the windows are properly sealed is first resort. And if you’re living with other people (partner, flatmates, family) it also helps to check the doors
Otherwise making sure the windows are properly sealed is first resort. And if you’re living with other people (partner, flatmates, family) it also helps to check the doors