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Why Do We Sleep?
HI Lac of Sleep Taes a Real Pound
Why Should Wor Mae Us Tired?
11 other sections not shown
alarm clock American amount of sleep average awake bad sleep bedroom Benjamin Franklin blood pressure bodily energy body breathing bring calories carbon dioxide cause cent CHAPTER Charles G clothes coffee coil spring cold Colgate laboratory Colgate University Colonel Lindbergh cool curve degrees dream effect emotional fatigue experiments eyes fifteen four hours fresh air getting glycogen going to sleep half hours in bed hours of sleep human guinea pigs hundred inches increases insomnia keep lactic acid latent content less fatigue lift light link spring loss of sleep Louisiana Territory machine mattress minutes morning motor muscles muscular tension noise oxygen period person physical pillow quickly quiet reaction restful sleep six hours slept soft sound-absorbing speed Stonewall Jackson subjects temperature theories tion tional tired feeling tiredness trained typist waked sleeper walking weight window women workers