I'd be productive... super productive. I have actually thought about this in the past, and thought how wonderful it would be if humans didn't need to sleep. After all, those 8 hours most of us take every night to sleep could be put to a better use! Like for example getting a job or learning a new language. There are so many things we could do during that time! I often think of sleeping as a waste of time... specially now that I need to work extra because I've a lot financial issues!