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We did a lot to find out if there's any connection between freediving and sleep apnia, but failed to find out anything to clear up the question, except for the fact that numerous studies on CO2 tolerance revealed that freedivers do not have noticeably higher CO2 tolerance than other people. As another forum participant wittily remarked, there's overlap of apnea diving and apnea sleep, but most apnea divers do not apnea sleep, while most apnea sleepers never apnea dive.

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