I have mixed feelings about that article, simply because it's just another pharmaceutical company releasing the drug. Of course it'll only show the good side of the drug for now, who knows what can happen (as one example described above showed) down the road.
I also think that tampering with our bodies through drugs or science isn't always the best way. You can probably alter you sleep schedule (as was shown very successfuly by Steve through polyphasic sleep), but that seems to be a more natural way of just simply switching to another type of sleep schedule.
At the end of the day though, it's hard to say what's optimal in the long run. Maybe only the normal 7-8 hours a day is best and anything else after years isn't that great for you.