Dreaming and offline memory consolidation.

Dreaming is shaped by the brain's consolidation of memories during sleep. After new information is learned, memory traces are gradually stabilized and reorganized for long-term storage. Sleep provides an ideal state for this process, allowing memory networks to be reactivated without new sensory input. This reactivation and consolidation influences conscious experience during sleep, contributing to dream content recalled upon waking. The article reviews evidence supporting this hypothesis and addresses common objections.

Study at a glance

Abstract

Converging evidence suggests that dreaming is influenced by the consolidation of memory during sleep. Following encoding, recently formed memory traces are gradually stabilized and reorganized into a more permanent form of long-term storage. Sleep provides an optimal neurophysiological state to facilitate this process, allowing memory networks to be repeatedly reactivated in the absence of new sensory input. The process of memory reactivation and consolidation in the sleeping brain appears to influence conscious experience during sleep, contributing to dream content recalled on awakening. This article outlines several lines of evidence in support of this hypothesis, and responds to some common objections.