I don't believe running marathons is considered healthy. Actually any kind of intensive (I don't know the English term for it) sports would be considered not good for longevity most research says. I've seen (semi) prof runners, rowers and a badminton player in my own circles die of heart attacks and cancer (long) before their time, while people who never did much of anything sporty (and smoke + drink) are currently over 90 (yes, I personally know far more sport/health people dying before 60, and 50, than I know people who live unhealthy; no-one unhealthy died before 80, while in the 'healthy' category, I've had a lot of deaths). This all doesn't prove anything, neither does this article, but the lack of sleep would've been more interesting if the guy would be 'normal', aka, not running marathons, but play the weekly rounds of squash and golf.