Okay, so do any of these studies control for the number of hours the students - sorry, I mean subjects in the trial - sleep each night? Without looking at the d

Okay, so do any of these studies control for the number of hours the students - sorry, I mean subjects in the trial - sleep each night? Without looking at the data, I'd hazard a guess that all these studies show is that if you don't get at least 7 hours of sleep or so, you're less productive. And I'd further suggest that this is only particularly relevant to pilots, where the burst of energy you get following a nap might be worthwhile, since you don't need sustained energy to pilot, only enough to manage the difficult landings and takeoffs. For programmers, you need sustained concentration, so you need a solid seven hours of sleep per night (and from what I've read, especially for those under 25, 9 hours is a much better figure, and it will significantly improve your capacity to learn.)