We all need to work hard to be successful, there's no doubt about that, but we also need to restore our energy from time to tim. There are many different way's to do it, one i've already posted before is the 20 min shutdown, if you haven't read it yet then dig in, i will post the link below.
But another way thats also very effective is to take a step back every few day's, and just dedicate this evening to overlook what you have accomplished the last day's and enjoy it, take the night off and go out to enjoy the little things.
And on the next day you will feel regenerated and perhaps even more creative.
This is the link about my 20 min shutdown, enjoy reading :)