Why do people get tired when the weather is hot? Thank you for your questions.

1. In this environment, blood vessels in various parts of the human body dilate and blood supply to the brain is relatively small. In this case, people are prone to drowsiness. 2. Facing the rapid rise of temperature in spring, the growth of human body's yang has a process, which is relatively insufficient. At this time, people are sleepy. In winter, due to the lack of ultraviolet rays and sunshine, the body lacks enough vitamin D, which reduces the body's immunity and working ability. In addition, the intake of vitamins is also less, so spring is coming, and most of the body functions are in a semi-lethargic state.