You know the classic signs: You're dragging at work, you're yawning all day, you're sluggish and you swear you can actually hear your bed calling your name. You need to sleep.
On the days when a fourth cup of coffee is masking the most obvious signs, you might think you've won the battle. But don't kid yourself. There are some tell-tale, though surprising, signs that your body is craving shuteye, even if you might chalk them up to other factors.
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