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. Author manuscript; available in PMC: 2012 Aug 1.
Published in final edited form as: Neurobiol Aging. 2009 Sep 24;32(8):1514–1527. doi: 10.1016/j.neurobiolaging.2009.07.017

Figure 1.

Figure 1

Latency to sleep onset following ICV infusion of saline, 10 μg and 30 μg of Hcrt-1 (top panel) and Hcrt-2 (bottom panel) at ZT0. * = p<0.05 for post-hoc comparison of Hcrt-1 and Hcrt-2 treatments relative to vehicle. + = P<0.05 young vs. old at the same dose.