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History

Sleep, the Health Builder – Strength Magazine – March, 1923

Air is the only essential of human life that ranks above sleep in importance. Thirst and hunger affect the organism more slowly than does unrelieved activity. Action, muscular or mental,
produces characteristic toxins in the blood, and when these accumulate beyond the safety limit, nervousness, breakdown, insanity, or death results.

Stark CenterUniversity of Texas