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.)
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.)