Insomnia can be a short-term or chronic condition, but it always involves problems with falling asleep or staying asleep. Short-term (transient) insomnia can be caused by illness, stress, travel, or environmental factors. Long-term (chronic) insomnia may be due to underlying psychological or physical conditions.
Source: Insomnia | University of Maryland Medical Center http://umm.edu/health/medical/reports/articles/insomnia#ixzz2rblNZCS5
University of Maryland Medical Center
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Insomnia is a serious medical situation that can harm your health and your everyday life. Today I’m going to explain what insomnia is, its cause, and how to treat yourself if you have it.