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. Author manuscript; available in PMC: 2010 Jul 8.
Published in final edited form as: Curr Biol. 2008 Aug 5;18(15):R670–R679. doi: 10.1016/j.cub.2008.06.033

Figure 1.

Figure 1

Mammalian phylogenetic order is not strongly correlated with sleep parameters. Despite similar genetics and physiology, sleep times within mammalian orders overlap extensively. On the left are three pairs of animals that are in the same order but have very different sleep parameters. On the right are three pairs of animals from different orders with similar sleep amounts. Mammalian sleep times are not strongly correlated with phylogenetic order [1,13,33]. Photo of Eastern American Mole, courtesy Barbara L. Clauson and Robert M. Timm; the ajacent photo of J.M.S., courtesy of N.Y. Times. Photo of R.A., courtesy of Northwestern University. Photos of other animals courtesy of Wikipedia commons site.