The phrase "sleep apnea" refers to the condition, whereas the term "apnea" refers to the event. It's normal to have apneas, everyone has them. It's when you average 5 or more per hour that you are diagnosed with the condition known as sleep apnea.
This is all a result of the statistical analysis done by researchers who investigate both apneas and the condition known as sleep apnea. Another seemingly weird thing is the 10-second rule. Stop breathing for 9 seconds and it doesn't count! Stop breathing for 10 seconds or 100 seconds and it counts the same!!
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