Kleitman (Nathaniel Kleitman)

Nathaniel Kleitman was a pioneering sleep researcher who, along with colleagues, discovered key aspects of human sleep patterns. He is best known for identifying the 90-minute sleep cycle, which includes different stages of sleep such as REM and non-REM. Kleitman’s work helped us understand the importance of sleep for health, learning, and memory. His research provided foundational insights into how our bodies and brains rest and rejuvenate each night, influencing modern sleep medicine and hygiene practices.