REM sleep, or Rapid Eye Movement sleep, is a unique phase of the sleep cycle where the brain is highly active, resembling wakefulness. During this stage, your eyes move quickly under your eyelids, and most vivid dreams occur. This phase is essential for emotional regulation, memory consolidation, and overall brain health. In a typical night, you experience several cycles of REM sleep, usually lasting about 10 to 30 minutes each. As the night progresses, these periods become longer. Getting enough REM sleep is crucial for feeling refreshed and alert during the day, making it an important part of a healthy sleep routine.