Figure 6

Effect of hypnotics on the sleep EEG. Average EEG power spectra in nonREM sleep after the intake of the benzodiazepine receptor agonists midazolam (15 mg) and zopiclone (7.5 mg). The values are expressed for each frequency bin as a percentage of the placebo value (100%). Significant deviations from placebo are indicated by triangles (p < 0.05; two-tailed paired t-test on log-transformed absolute values). (Reanalysis of data from ref. 120)

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published 2000