New research confirms lack of sleep connected to getting sick

I know this full well from personal experience.

http://www.eurekalert.org/pub_releases/2015-08/cmu-nrc082815.php

Public Release: 31-Aug-2015
New research confirms lack of sleep connected to getting sick
Carnegie Mellon University

Scientists have long associated sufficient sleep with good health. Now they've confirmed it.

In 2009, Carnegie Mellon University's Sheldon Cohen found for the first time that insufficient sleep is associated with a greater likelihood of catching a cold.

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Now, Cohen, the Robert E. Doherty University Professor of Psychology in the Dietrich College of Humanities and Social Sciences, and researchers from UC San Francisco and the University of Pittsburgh Medical Center have confirmed that insufficient sleep is connected to an increased chance of getting sick. Published in the journal Sleep, the researchers used objective sleep measures to show that people who sleep six hours a night or less are more than four times more likely to catch a cold, compared to those who sleep more than seven hours in a night.

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