Understand and Use Dreams to Learn and Forget | Huberman Lab Essentials

Early-night slow wave sleep consolidates both fine and gross motor skills (e.g., a new dance move, a sport technique) and specific factual details. Selective deprivation of slow wave sleep impairs these forms of learning, indicating that if you’re acquiring new physical skills or detailed information, protecting the early part of your night is essential.

During REM sleep, the brain is highly active and dreams are vivid, but stress-related neuromodulators like norepinephrine/epinephrine are essentially absent. This allows the brain to replay emotionally loaded events and elaborate on them without triggering full fear or anxiety responses, gradually reducing emotional reactivity and preventing overgeneralized catastrophizing.

When people are selectively deprived of REM sleep, they become more irritable and prone to interpreting minor issues as major problems. Over time, REM loss disrupts the brain’s ability to prune unhelpful meanings and associations, contributing to hyper-emotionality and, in extreme cases, hallucinations—highlighting why sleep disturbances often track with psychological disorders.

REM involves replay of spatial experiences with precise neural firing patterns, helping solidify how places, people, and events relate. At the same time, it prunes irrelevant or misleading connections, preventing everything from feeling connected and threatening. This selective association-building underpins our sense of what ‘goes with’ what in daily life.

EMDR uses side-to-side eye movements—which naturally occur during self-generated movement—to suppress amygdala activity while patients recount trauma, gradually removing its emotional load. Ketamine, by blocking NMDA receptors and disrupting plasticity, can prevent strong emotional coupling to traumatic events if given soon after trauma. Both mirror REM’s combination of experience replay with reduced capacity to hard-wire fear.