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Performance and sleep physiology measures. A, Hit rate in Session 2. B, ΔValence was computed as the SAM Valence ratings for Session 2 minus SAM valence ratings for Session 1. C, ΔArousal was computed as the SAM Arousal rating for Session 2 minus SAM Arousal rating for Session 1 (error bars indicate SE). D, Relationship between REM and ΔValence was significant. The percentage of the third quarter of the night spent in REM (REM3%) negatively correlated with ΔValence for negative items.
