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Why am I so tired all the time?
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Chronic exhaustion is pretty common, but it is also treatable.
PHOTO: ERIC HELGAS/NYTIMES
Anna Gibbs
Figuring out why you are tired often requires a little detective work, said Shannon Sullivan, a sleep medicine specialist at Stanford University.
On the one hand, your sleep routine might just need a few tweaks. But certain health conditions or medications could also be to blame.
