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You could be dehydrated or hungover from alcohol.

It could be a caffeine addiction withdrawal: http://www.hopkinsmedicine.org/Press_releases/2004/09_29_04.html

You might also have sleep apnea, whereby your breathing gets obstructed (from bad snoring, for example) and you don't get enough oxygen to the brain while sleeping. Usually this can be determined by a sleep study, and, if you have apnea, there are mechanisms to be used to help keep you breathing smoothly during the night. http://www.nhlbi.nih.gov/health/dci/Diseases/SleepApnea/SleepApnea_WhatIs.html or it could be the jolt of sitting up suddenly in the morning. some scientists think that the jolt can give you a headache and make you bad tempered.

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14y ago
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11y ago

Cluster headaches are occasionally referred to as "alarm clock headaches" because of their ability to wake a person from sleep and because of the regularity of their timing: both the individual attacks and the clusters themselves can have a metronomic regularity; attacks striking at a precise time of day each morning or night is typical, even precisely at the same time a week later. The clusters tend to follow daylight saving time changes and happen more often in spring and fall equinox. This has prompted researchers to speculate an involvement of the brain's "biological clock" or circadian rhythm.

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Q: What causes you to get a severe headache every night at the same time?
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