Since I have been living in Moscow I have seen a shift in working hours compared to the US. In Russia people work late at night 11pm-1am and go late at work around 10:30 am. In the US many people are at work at 6:30 am and stay around 6-7pm
Early birds get all the credit. Research indicates that morning people tend to be more active and goal oriented, and such larks as Steve Jobs, Craig Newmark of Craigslist, and 25-year old David Karp, founder of the Tumblr blogging platform suggest that climbing the ladder of success is easier before breakfast.
So does that mean night owls are at a disadvantage? Research by Satoshi Kanazawa and colleagues at the London School of Economics and Political Science suggests no.
What counts is the number of hours of sleep, 8 hours is optimum for me and I have to sleep before 11 am for best performance.When I write my goals and plans for the next day before going to bed I increase my effectiveness.