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Related to dreaming sleep: REM sleep
See: repose, rest
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provide a biological model for the study of memory, [with] a functional role for dreaming sleep in promoting some aspect of the learning process.
Checks on brain electrical activity suggested that this process might be happening in a sleep phase between deep sleep, and dreaming sleep, called stage 2 non-rapid eye movement sleep, when fact-based memories are moved from "temporary storage" in the brain's hippocampus to another area called the pre-frontal cortex.
Once this dreaming sleep ends, the app wakes up the user within a minute to boost the chances of them remembering the dream.