It's very important to take care of yourself in order to thrive in this job.
I like to go for a massage once a week, or every second week. I get manicures and pedicures. Ok, it's mainly for work purposes but also very relaxing to sit and do nothing for 2 hours every week. I have started meditating again, which is wonderful to zone out and not focus on one particular thing. I also eat a very "healthy" diet which reduces the risk of me feeling like shit.
This week, I only worked 2 days (2 very full days) but as it was on the back of my days from last week's, I actually worked 5 days in a row, which is not good for me. I was scheduled to work a third day this week as I had an apartment, but as I had nothing solid scheduled and I was very tired, I decided to take the day off. I also hit my target by day 2 this week so I didn't feel guilty about not working. In the past, I would have ignored the warning signs of being too tired and worked away anyway but now I am very conscious of pushing myself too far and I am reluctant to do it.
Know your limits.
Eat and drink enough.
Exercise if you want to.
Pamper yourself now and again.
Do something that requires zero mental effort.
Oh and something else I have learned: don't squander your money because it can make you feel like you are working hard for absolutely zero return.