From Adam Bosworth on ‘Tensions on the web’:

Indeed, every year in August, I vanish for a month from the web, turn off email, and deal with the withdrawal and suddenly I relearn how to think and concentrate. In a world where knowledge and thinking is everything, it is ironic that increasing availability had led to decreasing time in which to reflect, ponder, and just let the mind wander and yet these periods tend to be essential to truly thinking hard.

As always, he is bang on target!