People differ in their diurnal (time-of-day) preferences—some are morning-types and others are evening-types. These differences are explored in a unique experiment design in which subjects are randomly assigned to produce paper airplanes at either 8:00 a.m. or 10:00 p.m... View more
Adan, A., and H. Almiral. 1991. “Horne and Ostberg morningness-eveningness questionnaire: a reduced scale.” Personality and Individual Differences, 12: 241-53.
Bjerner, B., A Holm, and A. Swensson. 1955. “Diurnal variation of mental performance: A study of three-shift workers.” British Journal of Industrial Medicine, 12: 103-11.
Coren, S. 1996. Sleep Thieves. New York: Free Press.
Smith, C. S., S. Folkard, R.A. Schmieder, L.F. Parra, E. Spelten, H. Almiral, R.N. Sen, S. Sahu, L.M. Perez, and J. Tisak. 2002. “Investigation of morning-evening orientation in six countries using the preferences of scale.” Personality and Individual Differences, 32: 949-968.