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One thing not mentioned yet in the other answers: Check your work environment. Is there enough light and fresh air? High CO2 levels can cause sleepiness (low oxygen levels usually cause headaches).


Fatigue and dizziness can be signs of dehydration or low blood sugar. So make sure you are staying hydrated and maintaining blood sugar levels throughout the day (sudden high levels that quickly drop low will make you feel tired). When I'm feeling tired at work I'll occasionally do 5-30 jumping jacks and that usually helps wake me up. You could try doing ...

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