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Means and SEM of sleep parameters for High and Low dream recallers (HR and LR). (A) Awakening index per sleep stage (number of awakenings per hour in each sleep stage). (B) Arousal index (AI) per sleep stage (number of arousals per hour in each sleep stage). (C) Percentage of short and long awakenings. (D) Mean duration of awakenings per sleep stages. Hatched columns represent standards values. *p < 0.05, **p < 0.01.
