Crash factors may include sleep loss, driving patterns -- early morning or late at night, for example, use of sedating medications, untreated or unrecognized sleep disorders, or consumption of alcohol.
When I go to bed and I'm supposed to be asleep, I sometimes talk to friends online or text them but it doesn't really affect my sleep because I like to wake up early.
Their husbands may be "salarymen" or white collar workers, who leave home in the early hours, and return merely to sleep.
BBC: NEWS | Programmes | This World | Retired husband syndrome
Three cheers for Professor John Zimmerman, who's finally doing some research to benefit Joe Public, and who has invented a device that lets parents sleep in late and put the kids to bed early on those long summer days.
ENGADGET: 'Reverse Alarm Clock' keeps the kids in bed so you can party
They had gone to sleep in their rental car and were woken in the early hours of the morning by a tapping on the window.
With schools starting early, kids often don't get enough sleep.
WSJ: How Much Sleep Do Children and Teenagers Need? Grown-Up Problems Start at Bedtime
For a long time, in the early hours of the morning, I was unable to sleep.
Contrary to popular belief, that extra early-morning hour doesn't necessarily mean more sleep.
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Or some underlying issue, partly explained by genetics and early childhood experiences, could be a precursor to both poor sleep and the mental disorders.
WSJ: How Much Sleep Do Children and Teenagers Need? Grown-Up Problems Start at Bedtime
Reporters jokingly have started betting on whether Bush -- who wakes up early and hits the pillow early, too -- will be able to fight off sleep at the 9 p.m. meeting with Abdullah, who wakes up late and works into the wee hours.
CNN: Traveling with Bush: Bling, strawberry juice and goat brains?
As for why children aren't getting enough sleep, present-day experts mostly point to the same culprit as their early 20th century counterparts, according to the study: the lure of modern technology.
"I'm running on two hours of sleep, " said Pitt senior Dmitry Kalika, who was evacuated from his dorm early Wednesday.
In winter, when the sky got dark early and Mother worried about her making the long commute home, Naima would sleep on my bedroom floor.
If you can not sleep, you can make out the Alps by moonlight and the Italian Lakes in the early morning before stepping off the train into a different kind of crowd and noise in the Lagoon City.
Noticing the circadian pattern of Charles B's depression, Dr Wehr asked him to get through a night without sleeping, and then to increase his nightly sleep only gradually, so that for almost a week he was awake during those crucial early-morning hours.
ECONOMIST: People, like all living things, are four dimensional
Sleep outside the park at either Sossusvlei Lodge or the self-catering Desert Camp, and rise early to catch the vivid orange dunefields at sunrise the next morning.
While the science is in the early stages, one hypothesis suggests that by promoting feelings of safety and security, shared sleep in healthy relationships may lower levels of cortisol, a stress hormone.
Early light was just breaking, and they, too, must have been startled out of sleep.
Early one Sunday morning, the shrill reverberating sound of my home phone woke me from a deep sleep.
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