It's not just the O2, but the mask sends presurized air in your nose. Forcing it past your most likely partly blocked airways. It happens at night as your tounge and throat muscle relax and close in on each other.
The mask is very light weight and once you get the straps adjusted and get used to it, you don't notice it.
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Date: 2007-08-16 08:03 am (UTC)The mask is very light weight and once you get the straps adjusted and get used to it, you don't notice it.