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How to know the difference between sleepiness and fatigue
Notice when you doze off.
Your eyelids might get heavy during the day from a boring class or meeting or after a heavy lunch. Keep track of when you feel like dozing off.
This can clue you into if you're simply sleepy or sleep deficient. Common times people get sleepy include : Sitting down in your office, classroom, or a meeting reading watching tv or a movie riding in a car for an hour without stopping waiting in traffic for a few minutes Check for physical symptoms.