Many sleep apnea patients have experienced severe headaches. Of course headaches are common among most people but there seems to be a correlation between lack of sleep and headaches, especially migraines.
Migraines are usually connected with the REM stage of sleep, which is the deepest sleep of the night and can occur 4 or 5 times. There are things that happen chemically in the brain during this stage that gives us the energy and alertness that we need to function through out the day. Since sleep apnea patients don't go into REM their brains are deprived of these chemical changes causing migraines.
Another cause of headaches is the lack of oxygen that sleep apnea patients experience on a nightly basis. Cluster headaches occur on one side of the head and usually during the last 2 hours of the night. There is also nasal problems and eye tearing with cluster headaches.
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