An Active, Purposeful Machine That Comes Out at Night to Play - New York Times

As if I haven't proven all of the following things, especially the infection part.

An Active, Purposeful Machine That Comes Out at Night to Play - New York Times: "Scientists have been trying to determine why people need sleep for more than 100 years. They have not learned much more than what every new parent quickly finds out: sleep loss makes you more reckless, more emotionally fragile, less able to concentrate and almost certainly more vulnerable to infection. They know, too, that some people get by on as few as three hours a night, even less, and that there are hearty souls who have stayed up for more than week without significant health problems."