The following excerpt is from an article that originally appeared on Mercola Articles
By Dr. Mercola
Are you tired? If your answer is yes, it would seem relatively straightforward to assume you’re not getting enough sleep. Yet, signs of sleep deprivation may not always be this obvious (and there are other factors besides sleep loss that can make you feel fatigued). The late Nathaniel Kleitman, Ph.D., professor emeritus in physiology at the University of Chicago, came up with one of the simplest tests to determine if you’re sleep deprived — and as a pioneer in sleep research, he was well qualified to know.
Not only did Kleitman co-discover REM sleep, but he published the first major textbook on sleep (“Sleep and Wakefulness” in 1939). He even stayed awake for 180 hours to figure out what sleep deprivation does to your body. Kleitman also spent more than one month underground in a cave — an environment without sunlight or schedules — in order topost was originally published on this site