Firstly, exercise can sometimes bring on a CH for me and definitely makes one worse if there's even a shadow.
But I do have a tendency to hold my breath and to shallow breathe, asleep and awake, have tried CPAP with no joy, but am now looking into diaphramatic breathing after a consultant recommended it and explained that CPAP doesn't strengthen my breathing muscles.
Idea behind this is obviously to improve my breathing, but also he says should increase my blood oxygen levels to see if it help the CH's, it's only been 3 weeks so far so no change in CH's as it could take months if at all, but my energy levels, sleep and breathing have all improved already, far better than CPAP.
SoÂ basically it's like turning myself into a CPAP machine day and night, so that way I won't starve my brain of oxygen at all, day or night.
.......slightly off on a tangent, sorry.
You say about a CH sometime after exercise too, I wonder if that's due to testosterone levels dropping after exercise rather than O2 and testosterone levels supposedly drop naturally in the evening also for both males and females, thought I'd mention this since there's some interest in T and CH at the minute.
Anyway, everyone's different and I'm different than mostÂ ;D, but interested to see where this topic goes and was intrigued to see that you sometimes get a CH after exercise too.