Word: circadian
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...melatonin supplements really help people sleep? Millions of jet-lagged and sleep-deprived Americans--citing countless self-help articles--insist they do. But the scientific evidence has been slim. There's no question that the hormone helps the brain tell a.m. from p.m.--regulating sleep cycles and circadian timing--when it is produced naturally by the body at night. What was lacking was clear evidence that taking melatonin in supplement form had the same sleep-inducing effect...
...real time, when melatonin is already being released by the brain, taking an extra dose of the hormone worked no better than taking a placebo. "It seems that what melatonin is doing," says Wyatt, "is knocking out the wake-promoting drive, which normally happens during the day, from your circadian clock...
...about 30 to 60 minutes, according to Timothy Roehrs, director of research at the Sleep Disorders and Research Center at Henry Ford Hospital in Detroit. He advises against oversleeping on weekend mornings to make up for a workweek of deprivation; late rising can disrupt your circadian rhythm, making it even harder later to get a full night's rest...
While most australians are sleeping, Dick Estens is plotting. Between 3 a.m. and 6 a.m., when truck drivers, factory hands and bakers are in a skirmish with their circadian rhythms, the 56-year-old cotton farmer from Moree, in northern New South Wales, is in bed whirling his mind through a problem. Estens might be crafting a game plan to outwit a Canberra bureaucrat or thinking of a way to motivate a juvenile criminal offender; he might be trying to understand the power structure in a small town or finessing a schmooze assault on a CEO target. This social entrepreneur...
Folks who are naturally early risers have an advantage at work and school because their circadian rhythms make it easier for them to arrive promptly and calmly, says a study from the University of Pittsburgh. Biologically, night owls find it tough to wake up on time, and their hectic mornings can throw off the rest of the day. Night owls who want to adjust their body clock may be able to do so by maximizing exposure to morning sunlight, wearing dark glasses in the hours before dusk and gradually shifting to an earlier bedtime...