How many hours of sleep a day is healthy sleep?

Generally, 8 hours is a normal sleep time, but the sleep time varies from person to person. Usually/kloc-adults over 0/8 years old sleep for 6-8 hours as the normal sleep time. If you don't feel tired after waking up for 8 hours, if you still feel sleepy, you can appropriately increase your sleep time, but it should not be too long. The average sleep time of each adult is 7.5 hours, and each person's sleep cycle includes two stages: deep sleep and shallow sleep. After falling asleep, it usually takes about 30 minutes to enter the deep sleep stage. Deep sleep and light sleep alternate in the daily sleep process, which usually takes four cycles to ensure a good rest for the brain. It takes about 2 hours to alternate between deep sleep and light sleep in each cycle, so it is normal for every adult to sleep 6-8 hours a day. If you can sleep for 6-8 hours every day, you can ensure that your brain gets a full rest during sleep, improve your daily metabolism, and prepare enough physical and mental strength for the next day's work and life. Ensuring a certain amount of sleep can maintain a stable physiological cycle and normal operation, thus ensuring a good internal environment for people's physiological functions and contributing to a healthy body. Staying up late for a long time is a fatal blow to your health and an overdraft for your life and health. If it is not corrected, the harm such as inattention, skin damage, decreased vision, decreased resistance and various diseases will come to you sooner or later.

Hazard 1: inattention

Staying up late means that the nerves responsible for work in the human body are working overtime. The consequence of nervous system fatigue is passive slack, such as inattention, and the brain will repair the cells responsible for memory during sleep. If you don't get enough rest, these cells will lose more and more, leading to memory loss, unresponsiveness, insomnia and headache.

Hazard 2: Skin damage

Generally speaking, the skin will remain at 10-1 1 at night. If you stay up late for a long time, the normal circulation of human endocrine and nervous system will be unbalanced, and the skin will have problems such as dryness, poor elasticity, dullness and lack of luster. Endocrine disorders can lead to skin problems such as acne, acne, chloasma and black spots.

Hazard 3: vision loss

Overloading the eyes for a long time can also cause problems such as eye pain, dryness and swelling, and even make people suffer from dry eye. Eye muscle fatigue can also lead to temporary vision loss, and may also induce central serous retinitis, leading to blurred vision, dark shadow in the center of visual field, distortion, narrowing of visual objects, color change of visual objects, and even sudden vision loss.

Hazard 4: Decreased resistance

Night is the peak time for the human body to produce new cells. Because staying up late makes the body in a state of exhaustion, the immune system will double its influence on the outside world and repair the tissues in the body, resulting in low body resistance and frequent illness. According to the survey, if adults can't guarantee normal sleep for three nights, their immune system function may be reduced by 60%.

Hazard 5: Induce other diseases

Staying up late for a long time will slow down metabolism and affect the absorption of various nutrients in the body. In particular, fats, carbohydrates and toxins are easy to accumulate in our bodies and will become obese over time. In addition, people who stay up late for a long time will show high load in blood pressure and heart rate regulation, and the regulation of vasoconstriction and immune function will also be abnormal: it may increase the possibility of cardiac ischemia, and may also increase the risk of coronary atherosclerosis and plaque instability, which will eventually lead to myocardial infarction, arrhythmia and other diseases, and may also lead to sudden cardiac death.

I would like to remind those party member who stay up late that staying up for a while is cool, staying up for a long time is uncomfortable, and it will be too late to regret it when you get sick.