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An 'insomnia cap' is supposed to help insomniacs sleep by lowering the temperature of the brain.
Increased metabolism in the frontal cortex of the brain is associated with insomnia; by cooling that area of the brain the metabolism is reduced. The idea is to create a special cap that will cool the cortex with tubes of circulating water. The insomniacs will not only fall asleep faster than the non-insomniac people, they also will stay asleep for 89 percent of the time.