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. 1998 Jul 21;95(15):8957–8962. doi: 10.1073/pnas.95.15.8957

Figure 2.

Figure 2

NREM sleep in a 3-h light/3-h dark cycle. Sleep was recorded continuously for 4 days in a 3-h light (500 lux)/3-h dark (0 lux) cycle, yielding 16 6-h trials per rat. The percentage of time spent in NREM sleep, REM sleep, and waking was determined by compiling trials and averaging state scores for corresponding epochs across trials for each rat. Data are plotted as the average percentage of time spent in NREM sleep determined in 30-s epochs, averaged across lighting periods and days in six control rats (A), six rats with VC lesions (B), and five rats with SC-PT lesions (C). Epochs are in sequence from the time of a transition from light to dark, or vice versa. Shaded bars represent lights-off and also indicate the average percentage of time spent in NREM sleep during the dark periods.