4: The Science of Sleep – Understanding the Stages and REM

This episode explains how sleep is divided into stages—including REM sleep, where most vivid dreaming occurs. We explore what happens in the brain during REM, why it's essential for memory, emotion, and learning, and how factors like stress or alcohol affect it. The episode also touches on how dreams differ between REM and non-REM stages, showing that dreaming is deeply rooted in brain biology.