For several years now I have found myself in a semi-manic state of mind that, initially, had me concerned. Fortunately, a professional friend recognized what I have been experiencing as “flow,” and gave me a book that explains the concept:

“People enter a flow state when they are fully absorbed in activity during which they lose their sense of time and have feelings of great satisfaction. Mr. Csikszentmihalyi (author of Flow) describes flow as “being completely involved in an activity for its own sake. The ego falls away. Time flies. Every action, movement, and thought follows inevitably from the previous one, like playing jazz. Your whole being is involved, and you’re using your skills to the utmost.”