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. 2014 Nov 1;37(11):1745–1756. doi: 10.5665/sleep.4164

Figure 4.

Figure 4

Slow-wave energy (SWE), slow-wave activity (SWA), and theta band activity changes in the Fz, O2, and C3 electroencephalographic (EEG) derivations in each non-rapid eye movement (NREM) cycle during recovery night 1 for the high workload + sleep restriction condition. (A) SWE, (B) SWA, and (C) theta band activity responses on recovery night (R1) in the high workload + sleep restriction condition (HW + SR). The SWE, SWA, and theta band activity for each NREM cycle was expressed as a percentage of the mean SWE, SWA, and theta band activity, respectively, in all NREM sleep periods during the 8-h baseline night. SWE in the occipital (O2) region was significantly higher than in the central (C3) region in the first NREM sleep cycle. Similarly, SWA in the frontal (Fz) and O2 regions was significantly higher than in the C3 region in the first NREM sleep cycle. SWE and SWA were significantly higher in the O2 derivation than in the Fz and C3 regions in NREM cycle 4, suggesting the local (O2) increase of sleep homeostasis persisted over the entire recovery night sleep period. Least squares mean (± standard error of the mean), controlling for covariates (age and sex). * P < 0.05. NREM, non rapid-eye movement.