Rainy days are for sleeping!
Some natural sounds, like the pitter-patter of rain, the soft fall of snow, the whistling of wind, or the crash of ocean waves, can help induce sleep. According to some scholars, the main reason is that humans have developed a physiological response akin to a conditioned reflex over the long course of their evolution.
During such bad weather, early humans would rarely venture out for activities like gathering, hunting, or fishing. Instead, they would stay cooped up in their shelters.
To conserve energy, sleeping became the primary option.
Furthermore, these natural sounds possess a certain rhythm and cadence, which have a hypnotic effect and can make people feel peaceful in both body and mind.
However, the soft patter of rain from Wang Chuan's phone made Yan Feifan feel drowsy in a very short time.
For the effect to be so pronounced, there was clearly another reason at play.
