Relationship to Internat ional Classification of 
Sleep Disorders
REM sleep behavior disorder is virtually identical to REM sleep beha vior disorder in the
International Classification of Sleep Disorders,  2nd Edition (ICSD-2).
Restless Legs Syndrome
Diagnostic Criteria 333.94 (G25.81)
A. An urge to move the legs, usually accompanied by or in response to uncomfortable and
unpleasant sensations in the legs, characterized by all of the following:
1. The urge to move the legs begins or wors ens during periods of rest or inactivity.
2. The urge to move the legs is partial ly or totally relieved by movement.
3. The urge to move the legs is worse in the evening or at night than during the day,
or occurs only in the evening or at night. 
B. The symptoms in Criterion A occur at least three times per week and have persisted
for at least 3 months.
C. The symptoms in Criterion A are accompanied by significant distress or impairment in
social, occupational, educational, academic, behavioral, or other important areas of
functioning. 
D. The symptoms in Criterion A are not attributable to another mental disorder or medical
condition (e.g., arthritis, l eg edema, peripheral ischemia, leg cramps) and are not better
explained by a behavioral condition (e.g., positional discomfort, h abitual foot tapping).
E. The symptoms are not attributable to the physiological effects of a drug of abuse or
medication (e.g., akathisia).