now that is interesting. I can quite agree with your theory in principle.
Another contributing factor may be the night-time apnea that many asthmatics (including me) suffer from. Basically, it involves waking up in the middle of the night with a wheezy chest, a light headache and some difficulty breathing. Presumably the headache is caused by mild hypoxia or hypercapnia, so it is not unreasonable to suggest that the body builds up some tolerance to these conditions.
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