Whenever motivation strikes, REAL raw motivation, I tend to take it for granted. Though, in the past I have learned to take my motivation for what its worth. If I feel motivated to run miles, I will. If I feel motivated to write tens of articles, I do it.
Don't expect your motivation to linger into the next day. Use it for all its worth while the energy is present. It will surely boost your productivity and earnings, and you will feel that much more accomplished!