A sample of poor sleepers (37 boys and 16 girls) and a matched sample of 53 good sleepers were selected from a national study of 831 emotionally disturbed adolescents in treatment. Psychotherapists'' ratings on 552 variables were examined by comparing the endorsement rates of the 2 groups by means of a split-sample procedure. Poor and good sleepers were differentiated by 74 replicated characteristics, a number of which were highly unique to each group. Poor sleepers were consistently higher on measures associated with neuroticism; good sleepers were higher on measures associated with pseudo-normalcy or psychopathy.