This is fascinating -- I'm Reading
Imagine: How Creativity Works [1] by Jonah Lehrer right now, and it's about the science behind this exact principle. Essentially, Lehrer explores the conditions leading up to and surrounding insights, and investigates how certain environments and conditions contribute to creative breakthroughs. Really useful stuff for anyone working in a creative field.
[1] http://www.amazon.com/gp/product/0547386079/ref=as_li_ss_tl?...
Yep, it's an affiliate link. Go ahead, help me buy 1/10 of a cup of coffee.