Relationship between rapid eye-movement activity during nocturnal sleep and developmental quotient in infants with developmental disabilities

－Rapid eye-movement (REM) activity during nocturnal sleep was investigated in 27 infants with developmental disabilities. A relationship was found between REM sleep degree of REM and developmental psychomotor function. Developmental psychomotor scores were correlated with percentage of REM20, the percentage of sleep stages with REM. Age was not a factor in this relationship. Present findings are similar to earlier measures for adult patients with similar cognitive deficits