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health.ucsd.edu...
Although it’s a common belief that 8 hours of sleep is required for optimal health, a six-year study of more than one million adults ages 30 to 102 has shown that people who get only 6 to 7 hours a night have a lower death rate. Individuals who sleep 8 hours or more, or less than 4 hours a night, were shown to have a significantly increased death rate compared to those who averaged 6 to 7 hours.
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Each human individual exists in four universes or "planes" simultaneously: the physical universe, which is the result of coordinated mass mental projections on the part of its inhabitants; a dream universe, which is created in the same way but has less rigid natural laws; an adjacent electrical universe, where the inner self resides and all mental activity occurs; and an anti-matter universe of which Seth said very little. The various portions of the self, and the various universes, are all aspects of a single whole, though Seth referred to them separately for the sake of explication. Ultimately, there are no boundaries to the self just as there are no boundaries to any system of reality. All portions of the self contribute to dreams, which continue when the outer ego is awake.