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Try adding a nap in the middle of the weekdays, it should make you feel much better (around half an hour should be enough)

I agree, when I worked at a place where I could, I did, and it made the day much better.

Unfortunately, working on a contract at a customer location doesn't offer me much nap time.

Maybe you can try to explain customer that it is needed to improve your productivity? I think any sane customer would understand that.

I wish, I work for the government on contract by day, which by definition is insane.