Headache after waking up from sleep is related to many factors.
Too little sleep or poor sleep quality, the brain does not get enough rest, the brain nerves are still in a state of tension, so it shows as headache and dizziness after waking up from sleep.
Hypertension, generally due to poor blood pressure control, long-term pressure on blood vessels, morning vasoconstriction of the brain blood volume increased caused by pain in the back of the brain.
Sleeping with cold and flu can also cause headache after waking up.
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