Could also be that other factors that happen on AFDs are contributing. Like stress levels would be higher, etc. If you had a good day and went out drinking with friends, you'd have less stress and sleep better. But if an AFD happens during the middle of the week with a lot of stress, then your sleep would be off.
Apnea Board Moderator
Breathe deeply and count to zen.
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The CAs are probably from hyperventilation caused by increased pressure. Alcohol suppresses resperation which in turn could make it less likely that you will hyperventilate. This is just a guess as to what may be happening.
Hyperventilation should go away on its own in time with acclimation to pressure.