Fitness and Adventure: Mind over matter: Ultrarunner Dean Karnazes’s brain-training device

Fitness and Adventure on SI.com

Mind over matter: Ultrarunner Dean Karnazes’s brain-training device

Ultrarunner Dean Karnazes once ran for 82 hours straight, covering 350 miles. When you have to run that distance in training each week, your mind can be either your best friend or your worst enemy. That\'s why Karnazes has been using a high-tech device that trains his brain to sleep better and more efficiently. 

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