Different reasons: There are different headaches types and causes. From sleep medicine perspective, waking up with a headache is probably due to a sleep problem: most commonly sleep deprivation or sleep apnea.
Answered 7/3/2015
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3 doctors weighed in across 2 answers
A doctor has provided 1 answer
2 doctors weighed in across 2 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
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