[header] How to know the difference between sleepiness and fatigue [title] Notice when you doze off. [step] 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 : [substeps] 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 [title] Check for physical symptoms.