Imagine a disease that deprived people of a third of their conscious lives. We would be clamouring for a cure. We don’t have a cure for sleep yet: take 400mg of modafinil every eight hours, and you can sleep just one night in three. A mild version of electroshock therapy cuts the optimal nightly sleep time down from eight hours to four. As to what we would do with the extra waking hours, science is silent.
https://aeon.co/essays/technology-to-cut-down-on-sleep-is-just-around-the-corner
Exerpt from: http://www.bbc.com/future/story/20130412-can-tech-reduce-need-to-sleep