Headache is a common symptom of insomnia. Most of the times patients suffering from insomnia or lack of sleep, feels severe headache and keeps on taking medicine for headache, when the real problem is lack of sleep. Patient suffering from insomnia is not able to sleep at night and he thinks it is because of headache, when actually it is the other way round and headache is due to insomnia. So its important to identify headache caused because of lack of sleep in order to treat the correct problem. During headache because of insomnia, it is difficult to locate one part of head with pain. Also the headache is felt in back of the head and moves towards neck and shoulders. 
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