| http://www.w3.org/ns/prov#value | - According to the Mayo Clinic, most adults need seven to eight hours of sleep per night in order to feel their best.Some of the common causes of insomnia are stress, anxiety, and depression; prescription drugs, including several heart and blood-pressure medications; caffeine, alcohol, and nicotine; underlying medical conditions, such as Alzheimer's, Parkinson's, or diabetes; poor sleep habits; and
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