I found this list on Real Simple of the best time of day to do "things".
Here are my favorites:
Do Your Cardio Workout (not that I ever get out of work in time for this)
5 p.m. to 6 p.m.
"For increasing fitness, decreasing the chance of injury, and improving sleep, the best time to exercise is late afternoon or early evening," says Matthew Edlund, M.D., author of The Body Clock Advantage: Finding Your Best Time of Day to Succeed In: Love, Work, Play, Exercise ($15,amazon.com) and head of the Center for Circadian Medicine, in Sarasota, Florida. At these times, he says, your lungs use oxygen more efficiently, you're more coordinated, and your muscles are warmed up, so you're less likely to suffer a sprain or strain. Finish exercising at least three hours before bed so that when your head hits the pillow the extra adrenaline will no longer be pumping through your bloodstream (and other factors that keep you awake will also have subsided). Bonus: "If you're all wound up at the end of the day, exercise may be a great stress reliever," notes Shirley Archer of the Stanford Health Improvement Program, in Palo Alto, California.
Ask for a Raise
"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 Angelou Economics, in Austin. And you'll have a biological edge then, since, as Edlund, 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 morning, just go for it.
10 a.m.Arrive with your what-was-I-thinking sweater within the first hour a store is open. Workforces are leaner these days, but “retailers still need enough staff to open up, so that may be when they have the best ratio of staff to customers,” says Edward Fox, director of Southern Methodist University’s JCPenney Center for Retail Excellence, in Dallas. It may also be the only time all day when staff are at assigned posts, “so you can usually get someone to help,” notes former fashion stylist Linda Arroz, who spent years returning things she didn’t end up using for movies and TV shows. Fox adds that “the most experienced people get the best hours, so they will be working the day shift.” Finally, consider customer flow. “A city store may be busier during weekday lunch hours, a suburban store on weekend afternoons,” says Target spokesperson Lena Michaud.
The Best Time of Day to Fly"Although U.S. Department of Transportation statistics show that flights taking off between 6 a.m. and 7 a.m. have the best on-time record, those numbers are sometimes misleading," says Rally Caparas, an Atlanta-based air-traffic controller and a Travelocity "Eye on the Sky" correspondent for CNN. "On time" refers to when the plane pushes back from the gate. You can wait on the tarmac for an hour because of weather problems, which cause the vast majority of delays.
"Scheduling arrivals and departures between 11 a.m. and 1 p.m. local time," Caparas says, "will help you avoid most delay-causing weather patterns. This will also help you avoid airport rush hours, "which mostly coincide with workday rush hours," says Robert Baron, president of the Aviation Consulting Group, in Fort Lauderdale.
For best results, check for regional weather patterns and schedule accordingly. "For example, for the West Coast, fly in or out after noon Pacific Standard Time, when marine-level fog has dissipated," says Caparas. For southeastern and Gulf Coast hops, steer clear of the thunderstorms that kick up around 3 p.m. "Airline schedules are based on perfect weather conditions," he says. "You're more likely to be punctual if you follow Mother Nature's schedule."