As soon as it rains, many people will feel that sleeping is more fragrant than usual. In fact, this is not illusory, but has a certain scientific basis.
First, the sound of rain when it rains is actually a kind of white noise. It is a very uniform sound distributed in a variety of frequencies in 0 to 20 kg. It has a good help sleep effect and weaken the adverse effects of other factors on sleep and reduce sleep interference.
Second, the oxygen content in the rain and air is slightly reduced than the normal moment, which will calm the sympathetic nervous system in the human body and produce the effect of relaxation and drowsy.
Third, rain is always accompanied by cloudy days. When the pineal body in the human brain is dark, a special melatonin is secreted. Studies have shown that melatonin has the effects of reducing falling asleep time and reducing the number of awakening times. Sleep adjustment has a very important impact.
Fourth, thunderstorms, the concentration of negative ions increases. It brings not only wet air and rustling rain sounds, but also negative ions in the air. Studies have confirmed that negative ions have a certain treatment effect on related diseases such as human circulation systems. It is also called "vitamin in the air". The concentration of negative ions in rainy air is higher than usual, which can make the brain relax and relax, and it is easier to fall asleep!
一到下雨天，很多人会觉得比平时睡得更香其实这并不是错觉，而是有一定科学依据的。
第一，下雨时淅淅沥沥的雨声其实是一种白噪音，是一类频率在0~20千赫兹内分布十分均匀的声音。它具有良好的助力睡眠效果同时还可以弱化其他因素给睡眠带来的不利影响，减少睡眠干扰。
第二，下雨天空气中的氧气含量比正常时刻略微降低，这会让人体内的交感神经系统冷静，产生全身放松、昏昏欲睡的效果。
第三，雨水总是伴随着阴天，人脑内的松果体在环境阴暗的时候会分泌一种特别的褪黑素，研究表明，褪黑素具有减少入睡时间、减少觉醒次数等作用对睡眠的调节有十分重要的影响。
第四，雷雨天气，负离子浓度增加，雨天带来的不仅仅是潮湿的空气和沙沙的雨声还有空气中的负离子。研究证实，负离子对人体循环系统等相关疾病都有一定的治用疗作用也被称之为“空气中的维生素”。雨天空气中的负离子浓度较平时升高，可以让大脑处于放松的状态能让人精神放松，也就更容易入睡啦！