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sep 20, 1911 - Rene Legendre and Henri Pieron

Description:

Identified sleep inducing (hypogenic) molecule that accumulates in the body during waking hours "hypnotoxin" Did this by experiments with dogs.

Added to timeline:

History of Sleep study

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9 Oct 2018

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Date:

sep 20, 1911

Now

~ 114 years ago

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