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The vast majority of people with sleep apnea suffer from what’s called “obstructive sleep apnea”, or OSA (a small percentage of people have “central sleep apnea”. Central sleep apnea is very different from OSA, and is caused by neurological factors. I’ll be talking only about obstructive sleep apnea, or OSA, here).
When obstructive sleep apnea occurs, the tissues in your upper throat relax and collapse together while you’re sleeping. This blocks the air’s passage temporarily.
Here’s how it happens while you’re asleep: