03/04/2011 11:35 am ET Updated Nov 17, 2011

Can You Sound Tired? Science Says Yes

By Lara Salahi and Mark Abdelmalek, M.D.
ABC News

You might think a cup of coffee or a quick walk before heading to your job will cover up your exhaustion from long working hours and little sleep.

That is, until your co-worker outs you by saying, "You sound tired."

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