⏰ when

When was the first human sleep stage classification by EEG developed?

PsychologySleep

Quick Answer

Modern sleep stage classification emerged in 1953, when REM sleep was identified by Eugene Aserinsky and Nathaniel Kleitman.

The Full Story

In 1953, Eugene Aserinsky and Nathaniel Kleitman identified rapid eye movement, or REM sleep, through EEG-based sleep research. Their discovery transformed sleep science by showing that sleep includes distinct stages rather than one uniform state. The finding also connected REM sleep with vivid dreaming. It remains one of the most important discoveries in the psychology and physiology of sleep.

Key Facts

1.Key discovery in 1953
2.By Eugene Aserinsky and Nathaniel Kleitman
3.Identified REM sleep

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"The 1953 discovery that proved sleep has hidden stages"