Insomnia has many causes, and sleep difficulties can show up in several ways:

Laying awake worrying and unable to fall asleep
Not feeling refreshed when you wake up in the morning          
Waking up several times during the night       
Difficulty getting to sleep     
Use of caffeine, alcohol and some medications that cause sleeplessness 

Chronic insomnia can lead to mental health problems such as depression, or abuse of alcohol or other medications in order to gain sleep.

The Alpha-Stim SCS treats anxiety, depression, and/or insomnia with microcurrent using a method called cranial electrotherapy stimulation (CES).  It is well tolerated and very safe in contrast to drugs used in the treatment of mood disorders, many of which have been proven to have undesirable side effects and can be addictive.  

Research and published reports are listed by primary investigator, title and year in reverse chronological order.

Kirsch, Daniel L. and Gilula, Marshall. CES in the treatment of insomnia: A review and meta-analysis. Practical Pain Management, 7(7):28-39, 2007

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Kirsch, Daniel L. Cranial electrotherapy stimulation for the treatment of anxiety, depression, insomnia and other conditions. Insert: Giordano, James. Illustrating how CES works. Natural Medicine, 23:118-120, 2006.
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Gilula, Marshall F. and Barach, Paul R. Cranial electrotherapy stimulation: a safe neuromedical treatment for anxiety, depression or insomnia. Southern Medical Journal. 97(12):1269-1270, 2004.
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Kirsch, Daniel, L. and Smith R.Cranial electrotherapy stimulation for anxiety, depression, insomnia, cognitive dysfunction, and pain. In Bioelectromagnetic Medicine. Paul J. Rosch, Ed. Marcel Dekker, New York, Pp 727-740, 2004.
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Kennerly, Richard. QEEG analysis of cranial electrotherapy: a pilot study. Journal of Neurotherapy (8)2, 2004. Presented at the International Society for Neuronal Regulation annual conference, September 18-21, 2003 in Houston, Texas.
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Kirsch, Daniel L. Postmarketing survey of Alpha-Stim CES patients. Summarized here and presented in detail in the book The Science Behind Cranial Electrotherapy Stimulation, 2nd Ed., Medical Scope Publishing Corporation, Edmonton, Alberta, Canada, 2002.

Schroeder, M.J., and Barr, R.E. Quantitative analysis of electroencephalogram during cranial electrotherapy stimulation. Clinical Neurophysiology. 112:2075-2083, 2001. Doctoral dissertation, The
Graduate School of the University of Texas at Austin, 191 pages, 1999
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Gibson, Thomas H, et. al. Cranial application of low level transcranial electrotherapy vs. relaxation instruction in anxious patients. American Journal of Electromedicine, 4(1):18-21, 1987. Doctoral dissertation (TG), California School of Professional Psychology, 152 pages, 1983.
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Lerner, Fred N, et. al. A doubleblind comparative study of microstimulation and placebo effect in short term treatment of the chronic back pain patient. Journal of the American Chiropractic Association, 15(11):101-106, 1981.

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