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. 2019 Apr 24;13:336. doi: 10.3389/fnins.2019.00336

FIGURE 1.

FIGURE 1

Sleep preparation is a thermoregulatory behaviour (A) shows typical nesting behaviour in four species. Mouse nesting (Mus musculus, C57Bl6/J), house cat (Felis catus) curling up, nest building in the chimpanzee (Pan troglodytes verus) and bedding (Homo sapiens). (B) Example of circadian temperature cycle over 6 days in a male C57Bl6/J mouse. (C) Average of transitions from the same mouse over 16 consecutive days 2 h before and after the light change. (D) Minimum temperature (n = 21) during light phase compared to minimum (n = 21) and maximum temperature (n = 16) in the dark phase, plotted as change from zero for a group of male C57Bl6/J mice. Data shown in (B–D) is from (Harding et al., unpublished). All images used with permission or copyright clearance. The nesting chimpanzee photo credit: Kathelijne Koops. The nesting cat photo credit: Isobel Harding, the sleeping human is available under CC0-1.0 universal and the nesting mouse is adapted from Deacon (2006).