Sleepiness or drowsiness is feeling like you have to sleep. If you’re sleepy, you might be able to sleep if given the chance, or you may doze off by accident.
Sleepiness is different from fatigue:
- Fatigue is a lack of physical or mental energy. It’s when you feel tired or exhausted.
- You can feel fatigued but have difficulty falling asleep.
- Although sleepiness and fatigue are different, you can have both at the same time.
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