Working The Graveyard Shift, Fighting The Sandman

Joe Palca, science correspondent, NPR
Jeanne Duffy, associate professor of medicine, Harvard Medical School

Air traffic controllers are hardly the only workers who struggle to stay awake while working overnight. Sleep researchers say that humans are not designed to be nocturnal, and that the body's clock can never fully adjust to night work.

Source: http://www.npr.org/2011/04/26/135741231/working-the-graveyard-shift-fighting-the-sandman?ft=1&f=5

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