ABSTRACT
The motor disorders of sleep represent a frequent challenge in the practice of sleep medicine. They are not, however, a uniform nosological category, as exemplified by the new current International Classification of Sleep Disorders (ICSD-2) in which the “Sleep Related Movement Disorders” section includes the following:
1. Restless legs syndrome (RLS) 2. Periodic limb movement disorder 3. Sleep-related leg cramps 4. Sleep-related bruxism 5. Sleep-related rhythmic movement disorder 6. Sleep-related movement disorders unspecified 7. Sleep-related movement disorders due to drug or substance 8. Sleep-related movement disorder due to medical condition (1)
Moreover, motor behavior is often a predominant feature of other categories of sleep disorders, such as the parasomnias.
