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The bottom line is that sleep loss means mind loss. Sleep loss cripples thinking, in just about every way you can measure thinking. Sleep loss hurts attention, executive function, immediate memory, working memory, mood, quantitative skills, logical reasoning ability, general math knowledge. Eventually, sleep loss affects manual dexterity, including find motor control and even gross motor movements, such as the ability to walk on a treadmill.
Brain Rules by Dr. John Medina
This explains why I enjoy taking a nap around mid-afternoon.
