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Across all three experiments, Fos expression in perifornical orexin-IR neurons correlates positively with the amount of wakefulness (r = 0.78; p < 0.0001) and negatively with the amounts of NREM (r= −0.78; p < 0.0001) and REM sleep (r = −0.63, p < 0.0001). ○, Experiment 1; ●, experiment 2; ■, experiment 3.
