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Wake Time - The total time scored as wakefulness in a polysomnogram occurring between "lights out" and final awakening. White Noise - A mixture of sound waves extending over a wide frequency range that may be used to mask unwanted noise that interferes with sleep. Also called white sound. Wilkinson Addition Test - A performance test in which the subjects add numbers for one hour. Often included in a battery of tests to measure the impact of acute or chronic sleep loss. Withdrawal - The negative effects experienced when a person stops taking sleeping pills.
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