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My employer tries to make people take time off (as many do) by not letting the accrued time continue. But my employer also has the managers periodically request that their people take time off as well, but it is managed by the employee.

As far as a vacation from a vacation, good advice. Yes it is stressful setting up the vacation plans and dealing with issues on vacation (things often go wrong, or not as planned).
So, what I do is spend part of the time on my vacation, and then come back home and spend a few days there, without work to think about.
This is a great way to 'be myself again.