"Feeling Tired in the Morning During the Rainy Season" — The Reality and Solutions for Orthostatic Dysregulation Affecting 1 in 10 Middle School Students

During this season of high humidity and low atmospheric pressure due to the rainy season, there is a significant increase in the number of middle school students who say they "can't get out of bed" or "often miss classes in the morning due to headaches." **Orthostatic Dysregulation (OD)**, a condition where autonomic nervous system dysfunction leads to decreased cerebral blood flow, is common among upper elementary to high school students. Reports indicate that about 10% of middle school students are affected, including mild cases. It is particularly prevalent among girls and accounts for 30-40% of reasons for school absenteeism, according to some surveys. The low pressure and lack of sunlight during the rainy season can suppress the sympathetic nervous system, exacerbating symptoms. However, symptoms often improve in the afternoon, leading to misunderstandings as "laziness." This article will detail the mechanisms, diagnostic criteria, treatment methods, and self-care for OD. It also provides explanations for overseas parents and educators reading through translation functions, covering Japan's rainy season, academic calendar, and differences with international clinical guidelines. We offer over 10,000 words of insights to help schools, families, and healthcare providers work together to ensure children can continue learning in a supportive environment.