[muzani]

Relevant video: https://www.youtube.com/watch?v=fc3c3OrpKSI

It's called ruminating. You do have to train yourself to stop thinking of work past a certain point. It's unhealthy and doesn't make you more productive. The 9-5 actually makes it worse, because you're helpless outside office hours.

The proposed solution is to acknowledge that it's anti-productive. And if you really have to think about work, do it in a productive manner - plan out a schedule, read a book, don't feel helpless.