How to Raise energy bar at work?

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Hi Friends, Sometimes I feel like what should I do to be energatic at work and feel dead and lethargic all the time. It may be bacuse of bad lifestyle habits but I follow a good lifestyle as I know. I want to sleep for 30 minutes when I feel dead but that is npot possible at work. How to boost energy level at work without compromising on productivety. Thank You.