Excessive napping may increase Alzheimer's risk? Reminder: The length of the nap should be controlled within this range

As early as 1986, there was investigation and research on napping. The original research project was to explore the rhythm experiment of human sleep and wakefulness, and to explore the mystery of human sleep.

　　The results show that a person can only stay fully awake for about 3 hours at a time , which means that after 4 hours , you will feel tired and sleepy.

　　In a day, there are two time periods that are most likely to cause sleepiness, which are 1-4 o'clock in the afternoon and 1-4 o'clock in the morning.

　　1-4 o'clock in the morning is the most natural sleep rhythm for human beings. Most people have fallen asleep before 11 o'clock in the middle of the night, so this sleepy period is very easy to pass. But it is different from 1-4 o'clock in the afternoon. At this stage, most people are working and studying.

　　The reason why it is easy to feel sleepy from 1 to 4 in the afternoon is that after a morning of exercise, the body has already fallen into a state of exhaustion . After lunch, a large amount of blood is supplied to the stomach to digest and absorb food , and the blood supply to the brain is relatively less oxygen, so it is very easy to feel sleepy. Therefore, from a clinical point of view, nap is also one of the physiological functions of the human body.

　　Siesta is like charging the human body. It can improve the efficiency of people's work and study in the afternoon, and it can also relieve the fatigue of the morning. There are even related research surveys that show that naps can also protect the heart, enhance memory, increase immune function, and relieve anxiety . However, this does not mean that the longer the nap, the better for the body.

　　You should know that human sleep is carried out in cycles, that is, the non- rapid eye movement period and the rapid eye movement period , which form a complete sleep cycle. If the nap time is too long, not only will it be easy to sleep more and more sleepy, but you will also have many problems such as dizziness and difficulty concentrating after waking up. At the same time, it can also affect nighttime sleep, eventually forming a vicious circle.

　　Not only that, but studies have shown that taking too long a nap may increase the chances of Alzheimer's!

　　The research comes from a research team at the University of California, who published a research paper in "Alzheimer's & Dementia" .

　　The paper conducted a meta-analysis of the nap times and frequency of 1,065 older adults, with an average age of 81 . The results showed that compared with those who napped for only one hour, the elderly who took a nap for more than one hour had a 40% higher risk of developing Alzheimer's disease .

　　The study also showed that if the nap time exceeds 60 minutes for a long time, it may also increase the risk of cardiovascular disease by 34%. Therefore, from a clinical point of view, although naps are beneficial, for the sake of health, one should control one's nap time.

　　As for how long the nap time is best, it varies from person to person. Different groups of people have different nap habits, but from an overall point of view, the nap time should be controlled within 40 minutes, and the best time is 30 minutes. .

　　Finally, I would like to remind everyone that not everyone is suitable for taking a nap. Especially for people with problems such as insomnia and poor sleep quality, if they choose to take a nap at noon or take a long nap, it will affect the nighttime sleep rhythm, aggravate insomnia, and even form a vicious circle.

　　Therefore, whether to take a nap and how long the nap time should be controlled depends on individual circumstances.