Scientists have studied the "aha!" moment at the level of puzzle-solving, and the results are fascinating. Basically, to cultivate "aha!" moments, we need to redirect our thinking. We need to shift our perspective and look at the same problem in new ways. We need to relax and allow our brains to make seemingly random connections that turn out to be not so random after all.
(Read the article at http://www.blog.newsweek.com/blogs/labnotes/archive/2008/01/22/eureka-how-the-brain-has-aha-moments.aspx).
Hmm, sound familiar?