Last school year was very demanding. Through a lot of circumstances I had a full teaching load plus coaching duties for two very time consuming sports. Prior to that school year, I had already made the decision to step back from my school responsibilities and call the 16-17 my last year coaching. Overall, it has proven to be a very good decision. Not only have I been able to focus on my teaching more, but I have been able to incorporate a lot more time off into my schedule. This is something that gets talked about a lot and remains the most important thing, you need to have set times where you say "no" and do something, anything, else other than work.
To co-op a discussion from the fall, here's my work load #yearinmath measured in Stress Units™
While teaching still remains demanding, mostly because I have to make all kinds of stuff, it has been incredibly more manageable this year. Two nights a week (Wednesday and Friday) I don't do anything school related after hours. Saturdays are generally off limits too. As much as I like to think about school constantly (and I'm usually thinking about school constantly), I don't act on any of it when it's a night off. Secondary to this, I have become comfortable in my ability to do the job. As I told a panel of aspiring student teachers a little while ago, eventually you can plan 3 completely different 90 minutes blocks in about 20 minutes.
Regardless of experience level, make sure you're forcing yourself to take time off. Whatever it is can wait, and whatever it is can be done faster than you think.