Love the suggestion about using hangers with clips to pull them together in the middle. Any tips (other than the previously mentioned duct tape) for the ones that are too short? It seems like that's most of them these days. I don't mind a little natural light in the morning, but I don't want to be forced to get up with the sun.

I've often resorted to taking extra pillows/luggage/backpacks/anything that might be (or stack up to be) tall enough and leaning them against the bottom of the curtains to try to seal that gap. Of course, there's never nearly enough to get it done. And in smaller rooms, you may end up just about blocking your path with luggage and pillows.