I used to know a teacher who would get up early in the morning, go to school, then come home and immediately start grading papers for the rest of the day. That is a good way to burn out.
Workaholism is never a good idea.
Even if you don't have a wild social life outside of school, just doing things that are not school related can be a great way to lower stress.
The first step to having a separate life is to try to do as much of your work at school as possible. Stay late and get your work finished if you have to. Avoid working at home as much as absolutely possible.
If you have children or if you have no choice but to do work at home, the best way to handle that situation is to work intensely for blocks of time. Don't just do work sporadically around the clock so that it feels like a 24 hour cycle of work. That is a good way to wear out in a hurry.