![]() Perhaps you've tried in the past to get your day started early, only to find yourself hitting the snooze button so many times you lost count. His research includes the rhythmic aspects of alertness, motivation, and performance morning versus evening activity preferences and sleep-disruption factors.If you're someone who feels most productive long after the sun has set, the idea that you could become a morning person might seem impossible. (Women need a bit more than men.)Īnd as more years pass, individuals in their sixties and seventies often find they can function quite well with only six and a half or seven hours of sleep per night-whether they're morning people, day people, or night owls.įrederick Brown, Ph.D., investigates the rhythms of human behavior. ![]() In their young and middle years, most adults-whether they're morning, day, or evening types-need eight or nine hours of sleep nightly. The great majority of day and morning types tend to become morning-oriented as they face the need to wake up and go to a job, work steady shifts, put in long hours, or take care of children. Evening types retain their evening preferences. ![]() Also, new social variables may kick in: "A lot of kids seem to say, regarding socializing and the party scene, 'Okay, been there, done that-now I've got to buckle down and tend to my academics so I can get a job after graduating.'"Īs people get a bit older, they become more synchronized to their built-in biological rhythms. That shift may result from physiological changes at the end of adolescence. For many, midway through college there's a shift away from a strong evening preference. "Most college students, like most members of the population in general, aren't true night owls, even though they tend to be evening-active," Brown says. We suspect it's linked to changes in sex hormones." Add that hormonal change to adolescent social pressures-the desire to get together and hang out, the need to attend evening classes or other activities, not to mention the temptations of DVDs, video games, and music-and you find young adults staying up late. "It seems to hit at about the time of puberty. "There's a strong developmental component involved in this genetically determined rhythm," Brown continues. The great majority of younger college students fall into this category. Those individuals also naturally awaken much later in the morning. My teenage son? "For people who are extreme evening types, one o'clock in the morning is still an active time. "Sounds like you're a strong morning person," he said. I told Brown about my early-to-bed, early-to-rise lifestyle. "Their natural period runs shorter or longer than that, a difference that can change the time they normally fall asleep-and, later, spontaneously awaken-by a couple of hours." However, 15 to 30 percent of people clearly do not follow the normal 24.1-hour cycle. "Even though somebody will swear he's a morning person or a night owl, that's often a false perception," Brown says. The vast majority of people are neither strong morning nor strong evening types-just day types. Fatigue? "A temporary slump of tiredness normally sets in between 4 and 6 in the afternoon-assuming the person gets up at 7 and goes to bed at 11." "Mood is higher in the afternoon for most people," Brown says. Physical vigor, for instance: A person is physically stronger in the afternoon, when temperature is higher. It turns out that the temperature rhythm is representative of what else is going on in the body. Later in the evening and into the night, our temperature drifts slowly downward again to its lowest phase." Every day our body temperature slowly increases until its highest phase may top out at well above 99. "In some individuals, it drops to nearly 96 degrees. "Our normal temperature is at its lowest phase about two hours before we waken," Brown says. Average normal body temperature is about 98.6 degrees F. Across the population, that rhythm averages about 24.1 hours long."ĭuring that cycle, many "phase relationships" play themselves out. "Everyone has an inborn basic biological rhythm-also called a circadian rhythm. "There is a strong genetic component determining whether a person is an evening or a morning type in their activity times," says Penn State psychology professor Frederick Brown. My college-freshman son, on the other hand, is the proverbial night owl: up around noon, and I don't even want to know when he gets to bed. I'm a dyed-in-the-wool morning guy: up at 5, nodding off by 9 PM.
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