2. After the thunderstorm, the negative ions in the air will increase. Negative ions can improve human nervous system and cardiovascular system. , make people feel comfortable, negative ions have sedative and hypnotic effects. At the same time, when it rains, the air pressure decreases, the oxygen content in the air decreases, the sympathetic nerve activity of people decreases, and it is easy to get sleepy.
3. Another important reason for wanting to sleep in rainy days is white noise. Refers to the sound in which the power of frequency components is uniform in the whole audible range of human ears. White noise can make people feel calm and relaxed, thus improving the quality of sleep. Not only the rustling in rainy days, but also the sound of running water, birds singing, the sound of waves hitting rocks and the rustling of wind blowing through leaves are all white noises.
Extended data:
White noise is a uniform sound with a frequency component of 0~20KHZ, which is called white noise. But for ordinary people, white noise generally refers to some pure natural noises, such as the sound of waves, the sound in the forest, the sound when it rains, etc.
Many people with insomnia wear headphones to listen to the rain and white noise at night, which can help us fall asleep. For newborns, playing white noise can also help them stop crying.