I find a time out works wonders.

I'm currently in the process of teaching myself PHP.. so I downloaded Xampp to my machine and in between designing, I take time outs and I tinker with codes.. I download scripts, I read through them.. I break them and I fix them again.

It's something interesting to do and it takes away from the monotony of doing the same thing day in, day out. Even when a person is doing something they love, it can become tiresome