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. 2014 Apr 26;63(2):205–213. doi: 10.1538/expanim.63.205

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©2014 Japanese Association for Laboratory Animal Science

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives (by-nc-nd) License.

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Fig. 1. — Diurnal rhythm of total sleep in seven inbred mouse strains: B6, PGN2, NJL, BLG2, KJR, MSM, and HMI. The prevalence (%) of total sleep is plotted at 1-h intervals. Each data point represents the means ± SE for 8 mice except for the HMI strain (n = 6). The bars at the top and bottom represent the 12-h light (white) and 12-h dark (black) phases, respectively. The values for the 12-h dark phase are duplicated to illustrate the changes at the light–dark transition. Gray bars at the top of each figure represent the period of total sleep >50%. Hatched bars at the top of each figure represent periods of total sleep <10%.