If you need to work too long hours then someone probably underestimated the work involved. Most likely you. So first piece of advice: improve your estimates.

Working long hours from time to time, when something breaks in production, when an important deadline is looming ahead, when ... is OK, just make sure you don't work long hours every day. Your life will suffer and the quality of your code will eventualy too.

Exercise. Preferably in some fun way. Dancing for example. There's no way you could be thinking about coding while whirling through the ballroom in valse rythm with a cute girl ;-) Best exercise I know.