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. 1998 Jul 15;510(Pt 2):651–659. doi: 10.1111/j.1469-7793.1998.651bk.x

Figure 2. Probability of arousal from sleep.

Figure 2

Probability of arousal from sleep during repetitive hypoxia (▪) and the probability of spontaneous arousal (□) during quiet sleep (upper panel) and active sleep (lower panel). Note that, with repeated exposure to hypoxia, lambs continued to arouse from quiet sleep whereas arousal was abolished after just 10 hypoxic exposures in active sleep. *P < 0.05, probability of arousal during hypoxia vs. probability of spontaneous arousal; †P < 0.05, probability of arousal during hypoxia vs. probability of arousal during hypoxia for the first 10 hypoxic exposures.