I get my motivation from Albert Einstein's quotes and my failures in life. I keep myself busy with jogging and interacting with different people. I day dream a lot before I get to sleep so I can remind myself of my goals in life. Just remember to whom are you doing this for. Hope this helps you

One more thing, what I do to keep me more motivated, I study different subject that has nothing to do with my main course. I'm reading about psychology, arts, literature, philosophy and food. That is to make my life interesting. You should try it, too just remember to avoid taking everything all at once. Just study one or two different subject. Don't force yourself to focus to only one subject.