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. Author manuscript; available in PMC: 2017 Sep 5.
Published in final edited form as: J Biol Rhythms. 2017 Jan 16;32(1):64–74. doi: 10.1177/0748730416685451

Figure 2.

Figure 2

Kaplan-Meier survival curves for cycle, NREM, and REM sleep episode durations. Cycle survival increased with age (A) (bootstrapped log-rank test, p = 0.01) due to increases in NREM sleep episode duration with age (B) (bootstrapped log rank test, p < 0.01), but the survival of REM sleep episodes showed no age-related change (C) (bootstrapped log rank test, p = 0.73).