This infographic was created from the following sources:
- Aserinsky, E., Eyelid condition at birth: relationship to adult mammalian sleep-waking patterns, In Rapid Eye Movement Sleep, edited by B.N. Mallick and S. Inoue, Narosa Publishing, New Delhi, 1999, p. 7.
- Campbell, S.S. and Tobler, I., Animal sleep: a review of sleep duration across phylogeny. Neuroscience and Biobehavioral Rev., 8:269–300, 1984.
- Kryger, M.H., Roth, T. and Dement, W.C., Principles and Practice of Sleep Medicine, W.B. Saunders Co., Philadelphia, 1989, pp. 39–41.
- Tobler, I., Napping and polyphasic sleep in mammals, In Sleep and Alertness: Chronobiological, Behavioral and Medical Aspects of Napping, edited by D.F. Dinges and R.J. Broughton, Raven Press, New York, 1989, pp. 9–31.
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