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. Author manuscript; available in PMC: 2013 Feb 5.
Published in final edited form as: Mol Cell Endocrinol. 2011 Sep 10;349(1):91–104. doi: 10.1016/j.mce.2011.09.003

Figure 1.

Figure 1

Independent influence of circadian phase (left panel) and time since start of sleep episode (right panel) on wakefulness in a scheduled sleep period. Reproduced with permission from Dijk and Czeisler (1994).