The circadian and homeostatic modulation of sleep pressure during wakefulness differs between morning and evening chronotypes.

Jacques Taillard, Pierre Philip, Olivier Coste, Patricia Sagaspe, Bernard Bioulac
Journal of Sleep Research. 2003-11-24; 12(4): 275-282
DOI: 10.1046/j.0962-1105.2003.00369.x

PubMed