Why do memories of vivid dreams disappear soon after waking up?

Why do memories of vivid dreams disappear soon after waking up?
—Gil Greengross, via e-mail
Ernest Hartmann, professor of psychiatry at Tufts University School of Medicine and director of the Sleep Disorders Center at Newton-Wellesley Hospital, explains: We forget almost all dreams soon after waking up. Our forgetfulness is generally attributed to neurochemical conditions in the brain that occur during REM sleep, a phase of sleep characterized by rapid eye movements and dreaming. But that

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