Van Dongen H.P.A, and D.F..Dinges. (2005) Circadian rhythms in sleepiness, alertness, and performance. In M.H. Kryger, R.Roth, and W.C. Dement (Eds.), Principles and Practice of Sleep Medicine, pp. 435-443. Philadelphia, PA: Elsevier.
Van Dongen, H.P.A. (2006). Shift work and inter-individual differences in sleep and sleepiness. Chronobiology International 23(6):1,139-1,147.
Van Dongen, H.P., M.D. Baynard, G. Maislin, and D.F. Dinges. (2004). Systematic interindividual differences in neurobehavioral impairment from sleep loss: Evidence of trait-like differential vulnerability. Sleep 27(3):423-433.
Vgontzas A.N., S. Pejovic, E. Zoumakis, H.M. Lin, E.O. Bixler, M. Basta, J. Fang, A. Sarrigiannidis, G.P. Chrousos, et al. (2007). Daytime napping after a night of sleep loss decreases sleepiness, improves performance, and causes beneficial changes in cortisol and interleukin-6 secretion. American Journal of Physiology-Endocrinology and Metabolism 292(1):E253-E261.
Webb, W.B. (1987). The proximal effects of two and four hour naps within extended performance without sleep. Psychophysiology 24(4):426-429.
Wu, J.C., J.C. Gillin, M.S. Buchsbaum, P. Chen, D.B. Keator, N.K. Wu, L.A. Darnall, J.H. Fallon, and W.E. Bunney. (2006). Frontal lobe metabolic decreases with sleep deprivation not totally reversed by recovery sleep. Neuropsychopharmacology 31(12):2,783-2,792.