Also, thank you to replying people about bright room/can't thick curtains things! The problem isn't just mold on the curtains, sadly, it's that without enough air flowing between (large, weirdly sized, and I suspect badly sealed) window and them in winter, it grows on the window frame too and then I'm having to scrub it off with vinegar. I had and tried to use shades, too, emphasis on had. Bonus, I'm allergic to mold. Right now I have an old thin sheet over the bigger window, but it's still so briiight. (No, I am not secretly a vampire. Really. If I were I'd be a pretty pathetic one. Can I be a werewolf instead? Or some kind of monster that's got good eyes and doesn't sleep forever. Ill-tempered and squeaky half housecat, half small raptor gryphon? Though cats sleep a lot, they seem to enjoy it :p.)