| http://www.w3.org/ns/prov#value | - Sleep is a state that is characterized by changes in brain wave activity, breathing, heart rate, body temperature, and other physiological functions.Depending on the sleep stage, different physiological functions may be more active and variable (for example, during REM sleep), or less active and more stable (for example, during NREM sleep).The reasons why we dream and the meaning of our dreams, de
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