Study / Registry

Non-24-Hour Disorder (Non-24) is a serious, rare, chronic circadian rhythm disorder (CRD) that affects the body’s ability to regulate the master body clock to a 24-hour day-night cycle. While rare in the general population, 70% of people who are totally blind and lack light perception have Non-24. The cyclical nature of the symptoms is sometimes not recognized, leading to a delay in diagnosis or a misdiagnosis and inappropriate treatment.

Through new research, scientists are discovering more about this CRD. If you have visual impairments and difficulty sleeping, please participate in an online survey about Non-24.