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2. Cluster headache - Wikipedia

   en.wikipedia.org/wiki/Cluster_headache

   Cluster headaches may occasionally be referred to as "alarm clock headache" because of the regularity of their recurrence. Cluster headaches often awaken individuals from sleep. Both individual attacks and the cluster grouping can have a metronomic regularity; attacks typically strike at a precise time of day each morning or night.

3. Demand valve oxygen therapy - Wikipedia

   en.wikipedia.org/wiki/Demand_Valve_Oxygen_Therapy

   DVOT is commonly used to treat conditions such as cluster headache, which affects up to four in 1000 people (0.4%), [1] [2] [3] and is a recommended first aid procedure for several diving disorders. [4] [5] It is also a recommended prophylactic for decompression sickness in the event of minor omitted decompression without symptoms. [5]

4. Headache - Wikipedia

   en.wikipedia.org/wiki/Headache

   A headache, also known as cephalalgia, is the symptom of pain in the face, head, or neck. It can occur as a migraine, tension-type headache, or cluster headache. [1] [2] There is an increased risk of depression in those with severe headaches. [3] Headaches can occur as a result of many conditions.

5. The painful facts: National Migraine and Headache Awareness ...

   www.aol.com/painful-facts-national-migraine...

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6. NIH classification of headaches - Wikipedia

   en.wikipedia.org/.../NIH_classification_of_headaches

   After migraine, the most common type of vascular headache is the "toxic" headache produced by fever. Other kinds of vascular headaches include cluster headaches , which are very severe recurrent short lasting headaches, often located through or around either eye and often wake the patients up at the same time every night.

7. Why daylight saving time can give you a headache and ... - AOL

   www.aol.com/news/why-daylight-saving-time...

   Add a headache to the list of potential health problems you may experience as daylight saving time starts. Americans spring forward at 2 a.m. on Sunday, March 10, setting clocks ahead one hour and ...