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Arousal threshold under conditions of placebo and trazodone for each subject. Trazodone did not alter the arousal threshold in non-REM sleep (−20.3 ± 3.7 vs. −19.3 ± 3.9 cm H2O; P = 0.52). Responders are indicated by a dashed line and circle marker (nonresponders are indicated by solid lines and squares).
