" One of Bob’s aphorisms,” says Stickgold, “is that for every two hours your brain spends taking in information during the day, it needs an hour of sleep to figure out what it means. If you don’t get that hour, you don’t figure it out. The difference between smart and wise is two hours more sleep a night.” This idea takes on a new dimension "

― John J. Ratey , Go Wild: Free Your Body and Mind from the Afflictions of Civilization