Why Do I Feel Physically Exhausted and Sleepy When It Is Overcast Outside?
1. Introduction Feeling physically exhausted and inexplicably sleepy on an overcast day is a direct physiological response to the lack of bright, natural sunlight, which disrupts the body’s circadian rhythm and alters hormone production. The human brain relies on intense light entering the retina to signal that it is daytime. When dense cloud cover blocks … Read more