There are many causes.: There are over 80 different types of sleep disorders. I am referring you to the mayo clinic website on causes of insomnia because there's not enough space here to answer the question. Best wishes and have a happy holiday season. www.mayoclinic.com/health/insomnia/ds00187/dsection=causes insomnia — comprehensive review covers symptoms, causes, treatment for this sleeping problem.
Answered 12/15/2013
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