"Now that I've been on prednisone for a month I have more energy and motivation and interest in things, and sleep for consecutive hours at night."
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This feeling is only temporary. Over time the opposite happens. Don't be deceived by the initial effects of prednisone. Euphoria is one of the common early side effects of prednisone but it typically doesn't last more than a few months at the initial dose. After that, people tend to need more prednisone for the same effect.
https://www.mayoclinicproceedings.org/article/S0025-6196(11)61160-9/fulltext
The medical meaning of euphoria is a "false sense of well being." I don't think people who are doing well need to take Prednisone. However, Prednisone works well for PMR. I just wish people didn't have to take prednisone for years after PMR is diagnosed.

Most medical professionals will "encourage" you to get off Prednisone as soon as possible.