A hypnic jerk is a sudden involuntary twitch or muscle contraction that occurs as you fall asleep. Also known as sleep starts, these hypnic jerks may jolt the entire body or affect only one part, like ...

Adult-onset leukodystrophies and genetic leukoencephalopathies comprise a diverse group of neurodegenerative disorders of white matter with a wide age of onset and phenotypic spectrum. Patients with ...