Horne-Ostberg 1976 19-item Morningness-Eveningness Questionnaire (MEQ): 5 chronotype categories from extreme-morning (70-86) to extreme-evening (16-30); genetic + environmental determinants; clock-gene polymorphisms.
Horne-Ostberg 1976 19-item Morningness-Eveningness Questionnaire (MEQ): 5 chronotype categories from extreme-morning (70-86) to extreme-evening (16-30); genetic + environmental determinants; clock-gene polymorphisms.