I have an entire notebook just filled with these premise bunnies. Only a handful might eventually turn into full fics, and I think you're right about them living under the bed, because I seem to get them at night, when I'm in bed. And then I can't get back to sleep until I write them down.

I'm getting to a really sad part of this current fic I'm working on, so it's a bit hard to write. I absolutely hate writing funerals...