Sleep Apnea
There is more than one pattern of abnormal breathing in sleep apnea. Narrowing of the throat can be complete (apnea) or partial (hypopneas and respiratory effort related arousals) but lead to the same consequence; repetitive disruption of sleep. Obstructive apnea and hypopnea may be accompanied by lack of oxygen. Most people will have a combination of abnormal breathing.
Warning signs of sleep apnea are:
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Loud snoring
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A pattern of snoring interrupted by pauses then gasps
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Falling asleep at inappropriate times
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Headaches or nausea upon awakening
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Frequent nighttime urination or even bed wetting
-AASM