There is little information about the sleep patterns of adults who have mental retardation and are supported in the community. In the present study, direct-care staff recorded sleep behaviors of 59 adults residing in 16 suburban group homes. Based on direct observation and measurement procedures, the adults averaged 7.9 hours of sleep each evening and had low incidence of sleep problems. Sleep duration was not influenced by age, gender, degree of mental retardation, or psychiatric status. Adults taking antidepressant medication (SSRI) had fewer hours of sleep. We discuss implications of these findings and factors contributing to healthy sleep hygiene among community-living adults with mental retardation.