Over past month, waking from sleep during cpap use with a suffocating feeling plus nausea.No problem with this mask in warmer weather, but mask vents appeared to be completely blocked due to ordinary / expected levels of condensation in tube with cooler weather.Hard to reliably prevent this given fluctuations in room temperature / humidity in local area - other masks i have used do not seem to lose venting.I am concerned about buildup of co2 from my exhalation to potentially dangerous levels.Likely inhaling too much co2.Fda safety report id# (b)(4).
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