Cabin oxygen level on take-off
Am I just a very relaxed flyer or is there some reason why I ALWAYS fall asleep on take-off? No matter what time of day I fly I make it to the safety briefing but am always spark-o by take off - to awaken when the food arrives.
My better half in convinced that it's because of lower oxygen levels in the cabin at take-off? Is there any truth to this?
Thanks