Multiple sclerosis (MS) is a disease of the central nervous system in which the immune system attacks the brain and spinal cord resulting in symptoms such as numbness, tingling, mood changes, memory problems, pain, fatigue, blindness, and paralysis. A survey of 2,100 adult MS patients and 3,000 otherwise healthy adults revealed that sleeping less than seven hours a night during adolescence is associated with a 40% higher risk for developing MS in adulthood. Journal of Neurology Neurosurgery & Psychiatry, January 2023