ACCELStars, based in Fukuoka, Japan, was founded in 2020 by a team of experts in sleep and circadian rhythms. Their flagship product, ACCEL, is the world's most accurate sleep measurement technology, capable of detecting mid-awakening with over 80% accuracy, compared to Fitbit and Apple watch's 50% accuracy. The company's mission is to improve the understanding of brain and mental illnesses by precisely measuring sleep, which is a sensitive biomarker of the brain. By offering sleep measurement technology that detects sleep and wakefulness, ACCELStars aims to provide accurate diagnosis and treatment support for sleep disorders.