I like listening to drama cds either while doing the dishes (not all chores, just the dishes lol), when browsing on my computer or when I'm doing crafts! Drawing, sculpting, and the like ;) I've actually listened while reading books too, although I don't do it too often. I can follow both stories without much trouble, but my friends have called me weird for doing it, haha
I like to use them as study material when I'm focusing on my listening skills, but I don't do it nearly as much as I should. I never listen to anything before bed though, it makes me feel too alert ;b