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You fall asleep.
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The muscles relax.
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Airway passages narrow and/or collapse, making breathing difficult or impossible.
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Loud snoring, snorts, pauses in airflow and laboured breathing often follow.
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Oxygen level begins to fall.
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You continue to struggle for breath, time goes by - 10, 20, 40 seconds between breaths.
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Heart rate falls below normal - there is decreased oxygen to pump through the body.
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Brain senses low oxygen/high carbon dioxide level, release a jolt of adrenalin - "fight of flight" response - to awaken the brain and body to prevent suffocation.
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Heart rate speeds up in response to rush of adrenalin. Now pumps above normal heart rate.
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You awaken briefly, take five or six large breaths, breathing in oxygen and blowing off excess carbon dioxide (CO2), then often repositioned on the bed.
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You typically do not remember arousal.
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Oxygen/Carbon dioxide levels return to near normal.
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Brain allows you to resume sleeping.
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You fall asleep.
This cycle repeats throughout the night! Some people who suffer from apnea experience these jolting experiences over 100 times per hour.