What time of day are you most alert?

Australia
April 2, 2007 6:51pm CST
SO, when is the time of day that you are most alert? Is it first thing in the morning or late at night after all those coffees? Maybe it could be after you get home from work; if your work is stress-less. I am wondering because I want to find the best time of day to do things that require you to be alert; such as write, analyze something or study. I know it will be different fot every unique individual; but I'm on the lookout for the most common time for people. All responses appreciated.