Their stress and hormone levels were monitored, as were their sleep patterns, and their moods.
Bartfield said other factors include a person's hydration, sleep duration, sleep patterns and emotions.
This was after adjusting for factors such as age, sleep patterns, kilometres driven, breaks taken and night-driving schedules.
The study did not clarify whether the babies' stress levels lowered as their sleep patterns settle over time.
Too much food or alcohol, especially late at night, just before bedtime, can play havoc with sleep patterns.
But the third change - fragmented sleep patterns the second half of the night - is less pleasant.
The San Francisco-based company makes the Fitbit Ultra, which monitors exercise and activity as well as sleep patterns.
FORBES: Connected Health Hot As Fitbit Raises $12 Million More
He said fatigue was not fully understood and other factors such as exercise, diet and sleep patterns played a role.
No doubt many bleary-eyed cycling fans will be looking forward to normalising their sleep patterns after three weeks of Le Tour.
It takes away the beauty of the night sky, often disturbs sleep patterns and can have a negative impact on our wildlife.
Psychologist Chris Dzikowski, the centre's director, said after monitoring Morris's sleep patterns in the laboratory, he found the features displayed were consistent with sleepwalking.
Health apps that allow users to test their heartbeat, monitor sleep patterns and keep a check on a variety of conditions are growing in popularity.
Perhaps the feature we were most excited about was Up's ability to track sleep patterns, something Fitbit has done for a couple of years now.
ENGADGET: Jawbone Up review (2012): a reboot and a shot at redemption
So much so that he attends the Institute of Lucid Dreams at the University of Greenwich, where his sleep patterns are monitored, and his dreams recorded.
Sleep patterns disrupted by shift work have been linked to heart disease, but this has also been linked to stress caused by unpleasant jobs, Prof Horne notes.
BBC: NEWS | UK | Magazine | Why should we have eight hours' sleep?
But Maurice Ohayon of the Sleep Disorders Center at Stanford University, California, said there was no evidence linking chocolate to violent sleep patterns in the general population.
Perhaps ironically, getting up earlier also creates healthier sleep patterns.
Maciek Drejak, lead developer of Sleep Cycle, says the app does record small movements, but when analyzing your sleep patterns, it "filters" the ones it doesn't think are relevant.
Now another product is arriving that promises to do basically the same thing -- namely, track your activity, sleep patterns and food intake using a wearable gadget and mobile app.
Everyone has different needs, sleep patterns, jobs, stressors and biologies, but chances are one or a combination of these apps and gadgets will lead you to your own sleepy path.
Among other things, the band can record how much distance the wearer has covered in a day and how many calories he has burned, and can even monitor his sleep patterns.
The app also features an optional upgrade service from Evoz that provides advanced monitoring, cry notifications via text or email, cry history information, and analysis of baby's crying and sleep patterns.
"We split the data in this way because older adults, especially women, tend to report more insomnia as they age, and sleep patterns in general start to change, " McClain says.
As a start, however, many people find it useful to begin carefully recording their sleep patterns to see for themselves how sleep disruption is associated with their symptoms getting better or worse.
Very short sleepers drank less tap water and consumed fewer total carbohydrates and lycopene, found in red and orange-colored fruits and vegetables and high in cancer-fighting antioxidants, than people with other sleep patterns.
"Further work is required, but night shift work and the associated changes in sleep patterns and hormones is incredibly complex and studies that will generate robust results are exceptionally hard to do, " he said.
For the study, very short sleep patterns were defined as less than five hours a night, short sleep was five to six hours a night, standard sleep was seven to eight hours, and long sleep was nine or more hours a night.
Unlike almost all competitive products that use only one sensor to 'read' the body, BodyMedia's monitors incorporate temperature, heat flux, galvanic skin response and 3-axis accelerometer sensors to get accurate measurements of calorie burn, exercise intensity and sleep patterns that affect weight as well as health.
ENGADGET: BodyMedia's CORE 2 armband tracks your health, or lack thereof
应用推荐