Some studies have shown that the nap is the most efficient kind of sleep, it can not only keep the brain awake, but also after the lunch break work efficiency will be greatly improved. Summer days are long, the night sleep time is short, appropriate nap can be good to eliminate fatigue, maintain energy. But many people know: if the lunch break is too long, you will feel more sleepy. At this time, if you force to get up will feel dizzy, uncomfortable around, up for a long time can not focus on work, learning efficiency will be greatly reduced. It turns out that, in general, after falling asleep for more than 30 minutes, people will enter the deep sleep stage from light sleep, when the inhibition process of the central nervous system of the brain deepens, many capillaries in the brain tissue are temporarily closed, and the blood flowing through the brain tissue is relatively reduced. If you wake up at this time, because the inhibited cerebral cortex has not yet been lifted and the closed capillaries have not yet been opened, the brain will have a temporary relative lack of blood supply, resulting in a temporary disorder of vegetative nerve function. As a result, the body feels uncomfortable and becomes more sleepy. This symptom is short for more than ten minutes, long for more than half an hour to disappear. Therefore, the summer lunch break should not be too long, to about 10 to 30 minutes is appropriate. This can not only improve efficiency, but also effective prevention of coronary heart disease. The hotter the day, the more to nap! Summer days are long and nights are short, the person’s sleep time at night itself will be shortened. The high temperature at noon will consume more energy, people will be more easily fatigued. Studies have shown that people who do not nap and nap compared to people, auditory discrimination ability significantly decreased, logical reasoning ability and mathematical performance decreased significantly, physical and mental physiological functions will also decline. At the same time, the afternoon is also a high incidence of heat stroke in summer time. Napping on the body’s physical and mental state and memory capacity and other aspects of a good recuperation effect, summer noon especially to nap to restore physical fitness. How to take a good nap? Method 1: take the head high feet low, right side lying sitting and ambulatory sleep will reduce the blood supply to the head, so that people wake up with dizziness, blurred vision, weakness and a series of symptoms of cerebral ischemia and hypoxia. Taking a head-high, right-sided position can reduce the pressure on the heart and prevent snoring. Method 2: After lunch, 15-20 minutes apart and then sleep If you have more time at noon, it is best to find a place where you can lie down, cover something on your body and take a solid sleep. Do not sleep on the table, or a long time will compress the nerves and blood vessels. If you can’t fall asleep for a while, close your eyes and focus your energy on the whistle, slowing down the rhythm of the whistle, which can help you fall asleep as soon as possible. Method 3: Light activity after waking up After napping, you should slowly stand up and drink a glass of water to replenish the blood volume and dilute the blood viscosity. Do not immediately engage in complex and dangerous work, because the first awakening often makes people produce a sense of trance. At the same time, nap can not be too casual. Science, effective napping is a good way to recharge health, do not nap into a “mis-sleep”. A good nap, about the mental state of the day.