Why is the mood related to the weather? ? _?

The behavior of all living things will be influenced by the environment, otherwise they will not be able to adapt to the environment. Human life activities are regulated by hormones, and the secretion of hormones is influenced by many internal stimuli (other hormones, thinking activities, internal pH, osmotic pressure, etc.). ) or external stimuli (weather (humidity, brightness, pressure, temperature), noise, etc.). ). So people's mood is related to the weather.