Do you snore?: Cluster, migraine and tension-type headaches may produce a headache that awakens an individual in the early morning hours (usually after 4 AM), or is present upon awakening. Withdrawal from caffeine, pain or other medications, as well as sleep apnea or high blood pressure have all been identified as causes. http://www.headaches.org/education/Headache_Topic_Sheets/Early_Morning_Awakening_Headach
Answered 9/28/2016
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