Causes of drowsiness in cold weather

Because winter begins to get shorter and the weather gets colder, people's metabolism will slow down, and the internal circulation of the human body is not as fast as that in summer. When the weather is cold, the human body needs more energy to maintain it. There is a gland called pineal gland deep in the human brain, which has an influence on the body's biological clock and sleep rhythm. In winter, when the pineal gland secretes more, people will have mental fatigue and lethargy.