Here's a little warning sign if you have a cocaine problem

You have this dream and you're doing cocaine in your sleep and can't fall asleep and you're doing cocaine in your sleep and you can't fall asleep and you wake up and you're doing cocaine ... bingo.

(Robin Williams, when he was good).
I remember being kind of addicted to tetris, you know, when you're falling asleep and the bricks start falling behind your eyelids as they sag.

Art dreams, too, there's that.