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Frequency and content of dreams and nightmares for female (black), male (white), gender not answered (gray). (A) Frequency of dream recall. (B) Frequency of dream content according to first or third person point of view. (C) Dream content according to time: plans, recent or old memories. (D) Dream features. (E) Nightmares features. (F) Sleep environment elements that incubate into dreams. (G) Recurrent dream features.
