Cluster headaches: Cluster headaches are severe type of headaches which often occur in middle of the night and affect men a lot more commonly compared to females. The exact mechanism isnt known. You can find a lot of information on http://www.Nlm.Nih.Gov/medlineplus/ency/article/000786.Htm nih or national institute of heajlth has information about most medical problems and will give you details about it.
Answered 12/9/2013
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Headaches: Your headaches could be coming from tension, eye strain, tooth grinding, dehydration, lack of sleep/poor sleep, skipping meals, stress, sleep apnea/snoring, or chronic sinus problems.
Answered 3/26/2013
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