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Figure 2 | BMC Neuroscience

Figure 2

From: Seasonal aspects of sleep in the Djungarian hamster

Figure 2

Winter-Summer difference in vigilance-state distribution. Light-dark differences in the vigilance states and slow-wave activity (SWA, mean EEG power density 0.75–4.0 Hz) in hamsters in physiological state belonging to winter and to summer. Mean 8-h and 16-h values (± SEM) expressed as percentage of the corresponding 24-h for waking, non-rapid eye movement (NREM) sleep and REM sleep. SWA in NREM sleep is expressed relative to the corresponding 24 h mean ( = 100%). Numbers within panels represent total amount in % of 24 h (mean ± SEM). Winter (W, n = 10) and summer (S, n = 11). Note different scales of panels. Winter vs. summer: *p < 0.01, **p < 0.005, ***p < 0.0005; unpaired t-test (for n = 6: waking p < 0.05, NREM sleep p = 0.065, REM sleep p < 0.01 and SWA p = 0.063, paired t-test).

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