Cognitive replay of visuomotor learning at sleep onset: temporal dynamics and relationship to task performance.
Sleep January 1, 2010 Erin J. Wamsley, Karen Perry, Ina Djonlagic et al.
During light NREM sleep, people's dream reports often replay recent waking experiences. In a visuomotor learning task, 30% of verbal reports collected from sleeping participants related to the task. The replay became more abstracted from the original experience as sleep progressed. These findings suggest that memory reactivation during sleep is reflected in subjective dream content, offering a window into cognitive processing in the sleeping brain.