Business Week, November 19, 2007
By Sonal Rupani


Some 70% of those earning at least $75,000 say they are at their best in the morning, vs. 40% of those making under $30,000, according to a Gallup Poll of 1,019 adults. Would you be richer if you could just rise earlier? Not necessarily, says London consultant Leon Kreitzman, co-author of Rhythms of Life. He cites a sleep-habit survey by Southampton University researchers, who caught up 20 years later with people polled in 1973. Late risers were actually a bit wealthier. Being a lark or an owl is genetic, and the income disparity Gallup found may result from self-selection in job picking, he says. "It's not a willpower thing."