Purpose - Nocturnal headaches among adolescents were reported to be increased with the development of modern technology. The purpose of this paper is to investigate the smartphone electromagnetic radiation related to nocturnal headaches among high school students. Design/methodology/approach - The time series study of all 12. 969 records from 145 high school students Chiang Mai Provin... https://hollandscountryclothinges.shop/product-category/lens-cleaner/