This is the keynote for my talk @ AppsterdamMilan #TalkLab on Nov. 20th 2014. Do we programmers have a "best time to work" in our day? Is it in the early morning, is it at night? Is there a scientific reason to prove this? How does the "flow theory" affect our jobs? This talks was inspired by Swizec Teller's "Why programmers work at night?" book, http://nightowlsbook.com