According to a study published by University College London on May 28th, sleeping less than 7 hours or more than 9 hours a day may have a negative impact on cognitive performance, including memory and reaction time.
Generally speaking, people who sleep less than 7 hours a day will make 5% more mistakes in the visual memory test, while those who sleep more than 9 hours will make 9% more mistakes.
The related results have been published in the British International Journal of Epidemiology. Dr Victoria Garfield, one of the authors of the report, said: "We still recommend that most healthy adults should follow it and keep their sleep time within the range of 7 to 9 hours every day."
However, the researchers also said that further research is needed to clarify the relationship between sleep duration and cognitive performance changes. In particular, there is not much evidence that the former is related to the risk of dementia, so it is necessary to conduct in-depth research in this area in the future.
Extended data:
The effect of sleep does not depend on time, but on quality. If someone thinks he sleeps well at night and is full of energy during the day, then he sleeps well, not for a long time.
Sleeping too long will not only make you full of energy, but also weaken your physical strength and spirit, making people look listless. And if you sleep too long, the brain cells in your body will not get enough oxygen supply, and their activity will gradually weaken.
People also need to pay attention to their sleeping position when sleeping. Good sleeping posture can greatly improve the quality of sleep. It is best to lie on the right side, with your legs slightly flexed and your whole body relaxed.
Lying on the right side can reduce the blood flow to the heart, reduce the burden on the heart, increase the blood flow to the liver, and make the liver metabolize better.
Phoenix. Sleeping less than 7 hours or more than 9 hours a day may affect memory.
Phoenix. Sleep is the best rest. How many hours do you sleep a day?