My apartment has yellow sac spiders ( Cheiracanthium inclusum), or so it seems from searching the internet. I find one generally monthly, wandering around on the walls or ceiling. I've heard conflicting reports about their bites. Are these spiders actually dangerous, or is it mostly overblown? I don't want to spray or call an exterminator, as I have T's. Any way to discourage them from living with me, other than lots of obsessive-compulsive cleaning? THank you!