Typical cabin pressure and oxygen levels are about the same as you would encounter at about 8,000 feet in elevation with short periods where the oxygen and pressure levels would be the equivalent of 10,000 feet. http://www.uptodate.com/patients/content/topic.do?topicKey=lung_dis/5339 [Broken]Is that why I do a long session of head nodding forward, chin going lax, and head snapping back up, repeatedly, for the first while when I get on planes? I can be fully rested and put me on a plane, and I'm all undignified head movements and facial expressions.
It's actually dangerous to fly and go scuba diving too close together (especially only seconds apart, since that would usually only occur if your plane crashed in the ocean).
Of course, I live at 6,000 feet in elevation, meaning either that's a poor excuse for me falling asleep on planes or that Lisab is correct about the oxygen level being a little low in my TV room. There's still something funny about the air in airplanes.
(I can hardly wait until I can take naps in front of a 52" flat screen HDTV. That'll be so great )
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