Word: circadian
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...worked in the lab of Molecular and Cellular Biology Professor Erin K. O’Shea for five semesters and two summers to prepare his thesis on temperature compensation in the three protein circadian clock...
Czeisler and his colleagues found that the body’s circadian rhythm—the natural 24-hour cycle—is actually able to partially override sleepiness during the day, which explains why some people mistakenly believe they have completely recovered lost sleep after only one or two nights of sleeping well...
...turns out that just three mechanisms combine to explain both activities. The first is our propensity to continue repeating a task once we've started: "Once you send one e-mail or write one letter, you tend to do another," says Malmgren. The second is our circadian sleep-wake cycle, which limits the available time we have to devote to letter-writing. The third is that we typically work on the same days each week, further restricting when and how long we spend getting in touch with friends. (See TIME's brain covers...
...salient issue, says study co-author Fred Turek, may be the disruption of the body's internal clock, known as the circadian rhythm. Eating at inappropriate times may disturb the body's natural rhythm, setting off a string of metabolic reactions that ultimately lead to weight gain. "Because our bodies are naturally cued to eat at certain times of the day, dining at the wrong time might affect the body's ability to maintain its energy balance," he explains, meaning that our body starts to use its calories differently than it normally would. That in turn could cause fluctuations...
...help some of the 100 million people who take international flights from the U.S. each year, and the millions more who live in a perpetual state of jet lag due to night-shift work. One strategy is to use light-dark exposure, which helps cue the body's circadian rhythm. British Airways, for example, offers a "jet-lag calculator" that applies research into bright-light therapy to advise passengers when to sit in a pitch-black room and when to seek bright light after a flight...