OSCAR BURRIEL / SCIENCE PHOTO LIBRARY OSCAR BURRIEL / SCIENCE PHOTO LIBRARY
Insomnia. Restless woman in bed trying to sleep, a beam of light illuminating her open eyes. Insomnia is a condition of perpetual tiredness, caused by an inability to sleep or an inability to sleep for an adequate length of time. Although insomnia may be related to some illnesses, it is far more likely to be caused by anxiety or the abuse of drugs or alcohol.
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