5 p.m.

"The key is finding a moment when your boss is not rushed and has time to truly listen," and that's most likely to be the end of the day, says Lynn Ellis, a career coach in Austin, Texas, who has worked with employees and bosses at global companies like Unilever. “That’s when I’m getting ready for the next day or looking ahead to the next week, and I’m in a good mood because I’m going home soon,” says Amy Holloway, a vice president at AngelouEconomics, in Austin. And you’ll have a biological edge then, since, as Body Clock Advantage (www.amazon.com) author Matthew Edlund, M.D., points out, your elevated body temperature makes you more alert in the late afternoon. But asking for a raise is not an exact science. Ellis advises tracking your boss’s daily habits to find the ideal, low-key time for him or her. And, in the end, if you’re at your best in the a.m., just go for it.