65582-9

Does respondent consistently fall asleep very late - 12 a.m. or later, at night and characterize him or herself as a night owl with a strong preference [PhenX]

Does respondent consistently fall asleep very late - 12 a.m. or later, at night and characterize him or herself as a night owl with a strong preference, a finding in the patient by PhenX, an ordinal result. PhenX measures.