Why do you feel sleepy in spring?

The so-called spring sleep is not a disease, but an adaptive response of human physiological functions to climate change. Because the winter weather in this city is cold and dry, in order to resist the cold weather, the skin is in a state of "convergence" for a long time, and vasoconstriction reduces the loss of body heat to maintain normal body temperature. Because the contraction of blood vessels increases the blood flow of various organs in the body, it will inevitably increase the blood flow of the brain, so brain nerve cells get more oxygen. So people often feel refreshed and energetic in winter. Of course, this is also related to the long nights, short days and adequate sleep in winter. However, in spring, due to the warmer weather, the state of human skin began to change from contraction to relaxation, and the blood flow increased, and the corresponding blood flow to brain cells decreased, which led to the suppression of the excitement of brain cells, so there was a phenomenon of listlessness and drowsiness. Some scholars also believe that sleepiness in spring is related to insufficient vitamin B 1 content in human body. Because of the arrival of spring, people's activities have increased, and the demand for B 1 has also increased. For people who are slow to respond to climate change, the lack of vitamin B 1 which stimulates the nervous system is more serious, so the phenomenon of spring sleep is also the most obvious.