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8 hours of sleep research

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Sleep is a naturally recurring state of mind and body, characterized by altered consciousness , relatively inhibited sensory activity, reduced muscle activity and inhibition of nearly all voluntary muscles during rapid eye movement REM sleep, [1] and reduced interactions with surroundings. Sleep occurs in repeating periods , in which the body alternates between two distinct modes: REM sleep and non-REM sleep. Although REM stands for "rapid eye movement", this mode of sleep has many other aspects, including virtual paralysis of the body. A well-known feature of sleep is the dream , an experience typically recounted in narrative form, which resembles waking life while in progress, but which usually can later be distinguished as fantasy. During sleep, most of the body's systems are in an anabolic state, helping to restore the immune, nervous, skeletal, and muscular systems; these are vital processes that maintain mood, memory, and cognitive function, and play a large role in the function of the endocrine and immune systems.

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SEE VIDEO BY TOPIC: How Much Sleep Do You Actually Need?

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How much sleep do we really need, and what happens if we get too little or too much? We spend about a third of our lives sleeping, so you've asked an important question. The National Sleep Foundation recommends seven to eight hours of sleep for people over age 64 and seven to nine hours for ages 18 to Kids need more sleep. Studies have asked large numbers of people how many hours of sleep they actually average and followed the health of these people over decades.

That's worrisome, because the average person has worse health outcomes including more obesity, diabetes, and heart disease, and shorter life if he or she sleeps less or more than these ranges, on average.

The important word is average. Some people who average more or less than these hours of sleep remain in excellent health. Perhaps they have different genes. Unfortunately, we currently have no way of telling if you might be one of those lucky people. So, as often is true in life, it's wisest to play the odds and follow the general advice. Also, don't be concerned if on any given night you sleep more or less than is advised. The advice applies to the average amount of sleep you get. A word of caution: You can't draw solid conclusions about cause and effect from such observational studies.

For example, you can't conclude that adults who average only six hours a night would necessarily improve their health by sleeping eight hours a night. To reach solid conclusions, you'd need to organize a study in which thousands of adults were assigned, at random: some to average less than seven hours of sleep a night; some to average seven to nine hours a night; and some to average more than nine hours a night.

Plus, you'd need to have a way of determining that they actually slept as long as they reported. Finally, you'd have to follow the health of these thousands of people for 30 years or more.

You can imagine how difficult it would be in the real world to conduct a study like that. Why do we need this much sleep? In recent years, we've learned that during sleep, waste material is flushed out of our brains. For example, the waste material includes proteins involved in Alzheimer's disease. A recent study in mice found that interrupting sleep repeatedly led to worsening atherosclerosis. It's much less clear why people who sleep more than recommended also have worse health outcomes.

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How much sleep do we really need?

Sleep is a vital indicator of overall health and well-being. Sleep needs vary across ages and are especially impacted by lifestyle and health. The National Sleep Foundation released the results of a world-class study that took more than two years of research to complete — an update to our most-cited guidelines on how much sleep you really need at each age.

Preliminary results from the world's largest sleep study have shown that people who sleep on average between 7 to 8 hours per night performed better cognitively than those who slept less, or more, than this amount. The world's largest sleep study was launched in June and within days more than 40, people from around the world participated in the online scientific investigation, which includes an in-depth questionnaire and a series of cognitive performance activities. Obviously, there have been many smaller sleep studies of people in laboratories but we wanted to find out what sleep is like in the real world," says Adrian Owen, Western's superstar researcher in Cognitive Neuroscience and Imaging.

The subject who is truly loyal to the Chief Magistrate will neither advise nor submit to arbitrary measures. This article was published more than 1 year ago. Some information in it may no longer be current. Maggie McTavish, 26, doing her daily routine of meditating, Oct. Maggie McTavish now thinks more clearly than she has in years.

5 Surprising Takeaways From The ‘World’s Largest’ Sleep Study

The amount of sleep you need depends on various factors — especially your age. While sleep needs vary significantly among individuals, consider these general guidelines for different age groups:. Some people claim to feel rested on just a few hours of sleep a night, but their performance is likely affected. Research shows that people who sleep so little over many nights don't perform as well on complex mental tasks as do people who get closer to seven hours of sleep a night. Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission. Any use of this site constitutes your agreement to the Terms and Conditions and Privacy Policy linked below. A single copy of these materials may be reprinted for noncommercial personal use only. This site complies with the HONcode standard for trustworthy health information: verify here. This content does not have an English version.

Sleep study finds we need 7 to 8 hours, but many aren’t clocking in enough

How much sleep do we really need, and what happens if we get too little or too much? We spend about a third of our lives sleeping, so you've asked an important question. The National Sleep Foundation recommends seven to eight hours of sleep for people over age 64 and seven to nine hours for ages 18 to Kids need more sleep.

College students, like Americans overall, are sleeping less, and if you are like most college students, chances are you are not getting enough sleep.

The quality of your sleep directly affects your mental and physical health and the quality of your waking life, including your productivity, emotional balance, brain and heart health, immune system, creativity, vitality, and even your weight. No other activity delivers so many benefits with so little effort! But even minimal sleep loss can take a substantial toll on your mood, energy, mental sharpness, and ability to handle stress. And over the long-term, chronic sleep loss can wreak havoc on your mental and physical health.

Sleep Needs

Scientists from Baylor University, Texas have found that a special incentive — in which students received extra marks on final exams for getting at least 8 hours of sleep — improved their grades. But before you jump to the obvious conclusion, their improved grades had nothing to do with being given extra marks, but rather, the extra sleep they had gotten. According to the Victoria State Government, sleep research suggests that a teenager needs 8 to 10 hours of sleep every night.

As anyone who has lay awake at night contemplating the complexities of the universe can attest, sleep is a slippery beast. That a nip of whiskey before bed helps you sleep better. Even that eating cheese before snoozing causes nightmares. Watch his talk on deep sleep here. All that with 8.

Sleep: how much do we really need?

The objective of the present study was to examine the association between self-reported sleep duration and features of the metabolic syndrome in adults. A cross-sectional analysis from the Quebec Family Study Canada was conducted on participants aged 18 to 65 years. Overall, A U-shaped relationship between sleep duration and the prevalence of metabolic syndrome Likewise, the clustered cardiometabolic risk score i. These results strongly suggest that short sleep duration is a risk factor for the metabolic syndrome. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

11, No. 8, The American Academy of Sleep Medicine and Sleep Research risk or presence of disease compared to 7–8 hours of sleep. There is less  by NF Watson - ‎ - ‎Cited by - ‎Related articles.

We often hear about the real dangers of getting too little sleep, but on the other end of the spectrum, sleeping too much also appears to have some risks. Sleep is a rapidly growing field of research, and we are learning more all the time about how rest affects the body and mind. More evidence is showing that spending an excessive amount of time in bed is also linked with health hazards.

Oversleeping: The Effects & Health Risks of Sleeping Too Much

Laboratory sleep research is of vital importance. But a sleep laboratory by nature is an artificial environment. And insight we can gain about sleep in our natural settings and routines is also important and revealing.

Sleeping hours: what is the ideal number and how does age impact this?

People who can get by on four hours of sleep sometimes brag about their strength and endurance. But recent scientific studies show that a lack of sleep causes many significant changes in the body and increases your risk for serious health concerns such as obesity, disease, and even early death. Sleep is an important function for many reasons.

Any more or less than that amount of time can potentially be detrimental to our hearts, new research shows. Researchers investigated the relationship between sleep duration and cardiovascular disease by performing a meta-analysis on 11 prior studies that had been published within the past five years.

The objective of this narrative review paper is to discuss about sleep duration needed across the lifespan. Sleep duration varies widely across the lifespan and shows an inverse relationship with age. Sleep duration recommendations issued by public health authorities are important for surveillance and help to inform the population of interventions, policies, and healthy sleep behaviors. However, the ideal amount of sleep required each night can vary between different individuals due to genetic factors and other reasons, and it is important to adapt our recommendations on a case-by-case basis.

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