Always exhausted? It may not be stress or stretching yourself too thin. Find out the real medical reason you're exhausted. Dr. Oz set up his own lab and uncovered the 4 secret reasons you're over-tired.
Click here for Part 2 of Dr. Oz's Exhaustion Lab.
Click here for Part 3 of Dr. Oz's Exhaustion Lab.
© 2013 Harpo, Inc. All rights reserved.
In partnership with