Summary:
- The article discusses the importance of understanding sleep stages and the 90-minute sleep cycle principle.
- It explains how the human sleep cycle is divided into different stages, including REM (Rapid Eye Movement) and non-REM sleep, and how these stages repeat in a roughly 90-minute pattern.
- The article emphasizes the benefits of aligning your sleep schedule with this 90-minute cycle, as it can lead to improved sleep quality, increased energy, and better overall health.