1. We are told that we need to sleep for eight hours
We often hear that we need to get eight hours of sleep each night. The UK National Health System and the US National Sleep Foundation recommend it. But where does this advice come from? Studies of different groups around the world come to a similar conclusion: those who sleep less and those who sleep more suffer from many diseases and have a shorter lifespan.
It is not yet known whether the diseases are caused by lack of sleep or whether this is a sign of an unhealthy life. Those who sleep less than six hours a night and those who sleep more than nine or 10 hours a day are in this category.
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Before puberty, children need at least 11 hours of sleep a night, and newborns need 18 hours of sleep. Teenagers should get 10 hours of sleep a night.
For example, people who are not fit do not exercise and thus sleep poorly. Then they do not exercise because they are tired.
Chronic lack of sleep, defined as getting one or two hours a night for a period of time, has been repeatedly linked by scientists to poor health.
2. What happens in your body if you don't get enough sleep?
Lack of sleep is cited as the cause of many disorders. A total of 153 studies involving five million people found that poor sleep is linked to diabetes, high blood pressure, heart disease and obesity.
Research shows that even a few nights of sleep deprivation puts healthy adults in a prediabetic state. Even moderate lack of sleep impairs their body's ability to control blood glucose levels.
Vaccines don't work when you're sleep deprived, and this suppresses our immune system, making us more susceptible to infections.
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One study found that people who slept less than seven hours were more likely to catch a cold than those who slept more than seven hours.
People who don't get enough sleep release the hormone ghrelin, which is linked to high levels of hunger. This can increase the risk of obesity.
Insomnia is thought to be linked to problems with brain function and even dementia.
prof. O'Mara says that toxic garbage accumulates in the brain during the day and that these wastes are removed from the body while sleeping. If you don't get enough sleep, you can go into a mild concussion.
The effects of sleeping too much are not well known. However, it is known to cause health problems, including mental decline in the elderly.