Expecting people to wake at 6.30am and then to be mentally sharp when they arrive at work at 8am or 9am involves something of a fight against nature. Like physical performance, your mental skills peak and trough at various times throughout the day. Logical reasoning tends to peak between 10am and noon; problem-solving between noon and 2pm; while mathematical calculations tend to be fastest around 9pm. We also experience a post-lunch dip in alertness and concentration between about 2pm and 3pm. However, these are averages, so an early riser’s peak in problem-solving may arrive several hours earlier than a night owl’s.
Research into this area is only just beginning, but managers with early-bird tendencies have been found to judge employees who start work later as less conscientious, and to rate their performance lower, compared to those who share such managers’ sleep preferences. Not only would a greater appreciation of these individual differences, and allowances for different schedules, help to level the playing field, it could boost workplace productivity, and employees’ health and happiness: “If you are forcing an evening person to show up at 7am, all you have is a grumpy employee who sits there and drinks coffee, procrastinating until 9am because he simply can’t focus,” says Stefan Volk, a management researcher at the University of Sydney Business School.
Linda Geddes, Guardian
