ALAIN DEX, PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY ALAIN DEX, PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY
Insomnia. Restless woman sits up in bed unable to sleep. She has an anxious expression on her face. 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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