New technologies have made the study of sleep cheaper, easier, and less intrusive.
I'd get seven hours of shut-eye a night because a six-year, large-scale population study of sleep done at the University of California, San Diego School of Medicine associated it with the lowest death rate among adults.
He points out that of 521 patients who took the drug in a safety study, 2 had forms of sleep paralysis, which can be a symptom of narcolepsy.
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After reading about a circulating water cooling cap that was used in a University of Pittsburgh School of Medicine sleep study, the girls set about creating a cheaper, lighter, and less onerous solution the cooling headband.
Our collective weariness is the subject of several new books, some by professionals who study sleep, others by amateurs who are short of it.
"Exercisers fall asleep faster, suffer fewer middle-of-the-night wake-ups and have a reduced risk of sleep disorders, " says study co-author Brad Cardinal, co-director of the sport and exercise psychology program at Oregon State University.
To account for the sleep variable, researchers in this study kept close tabs on the duration and quality of sleep of the participants.
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However, the actual cause of the connection between sleep and rocking was beyond the scope of the study.
In a company-funded study published last year in the Journal of Sleep Research, the Zeo predicted the same sleep cycle as professional sleep equipment in a lab about 75% of the time, compared with 86% agreement for two independent professional lab measures with each other.
During a sleep study, wires attached to the head monitor brain waves that reveal which stage of sleep a person is in.
After many years of study, no one knows how much sleep we need to function normally.
Study subjects who had less than seven hours of sleep were at greater risk than those who got eight hours of sleep a night.
"This area of research into the possible link between sleep apnea and heart disease is very much an emerging field of study, " Dr. Somers says.
It's not clear from this study whether cancer risk is truly affected by lack of sleep, says Rapoport, but it is certainly a possibility.
Why rhythmic rocking leads to better sleep went beyond the scope of the study, though the authors have several ideas based on the recent literature.
In the study, 25% of the patients had increased muscle activity during REM sleep.
Maybe we all might have gotten a lot more sleep had we known about recent results of another GRACE satellite study published in the journal Nature that shows that Himalayan glaciers are hardly melting at all.
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"It was like, 'No one has ever entered this country before, let's go in and take some pictures, '" says study author Michael Grandner, an instructor in psychiatry and member of the Center for Sleep and Circadian Neurobiology at Penn.
Study participants kept daily records and answered a list of 37 questions, which asked about sleep disturbances, sexual activity and mood swings, among other things.
Thirty percent of the teens had strong symptoms of depression, while an additional 32 percent had some depression symptoms, according to the study, which was presented today in San Antonio at SLEEP 2010, an annual meeting of sleep researchers.
In a new study published today in the journal Current Biology, Roenneberg and his colleagues surveyed the sleep habits of more than 65, 000 adults and found that people with different weekday and weekend sleep schedules had triple the odds of being overweight.
Two-thirds of the study participants reported at least one hour's difference in their average weekday and weekend sleep schedules, and more than 10% reported three-plus hours.
"First of all, I'd listen for weeks to memorize and really study what I'm hearing so I could sing it in my sleep, " she said of her preparation for the new album.
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Their study shows that as young people grow older they spend less of their sleeping time in slow wave or deep sleep.
Another study of 119 cancer patients with difficulty sleeping found valerian before bedtime for two months had no significant effect on sleep scores calculated from a questionnaire filled out before the study and after two months.
However the study does tally with several others, some of which have found that hormonal changes brought on by a lack of sleep can lead to an increased appetite.
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