Hi Bobby,
I'm not a doctor, but here's my layperson's take on the things you asked about:
1. To be aware you have a dream (or nightmare) you have to wake up enough
during the dream to be able to remember having it - whether you remember it vividly or hazily. Waking up enough to be aware that you had a dream means your REM sleep was disturbed - enough so that you wake up enough to know that you had a dream. And jolted into enough awakeness to stay awake long enough to commit it to memory. I personally think it's a sign that treatment is going well if a person
does NOT remember dreaming at all. That's not to say they aren't dreaming (dreaming is good) - it just means their cpap is doing its job preventing the hypopneas and apneas that are most likely to occur during the total relaxation of REM when we dream. No obstructive event during REM=no waking up to try to breathe=no remembrance of a dream. Just my opinion.
2. Dry mouth (
if you are using a nasal mask and are already using a heated humidifier) is likely a sign that your mouth is dropping open during the night and treatment air is escaping out your mouth - or you are breathing through your uncovered mouth instead of breathing at treatment pressure through the nasal mask. Either way, the air flow is drying your mouth. But worst of all, the treatment pressure is not getting down to where it's needed... into your throat to hold it open. Some people use a full face mask to keep the treatment pressure from escaping if their mouth falls open - you can breathe through nose or mouth with a full face mask. Or look into various means to keep the mouth closed and
especially keeping the lips closed, since puffs of air can escape through loosely closed lips even if the chin/jaw are up in closed position.
3. bloating - for cpap users, it usually means you are swallowing air (aerophagia). No easy solution that I've read about. Some people who experience that eventually stop swallowing air in their sleep after being on cpap for awhile (days, weeks, months?) Some get relief from sleeping with head and upper torso propped up higher. I've read some say it helped them to use a produce like GasX before bedtime; others said that didn't help at all. Something else that occurs to me is that dry mouth might cause a person to swallow too - increasing the chances of swallowing air. If pain from bloating is bad enough that it disturbs sleep or causes a person to think about not continuing cpap therapy at all, best to speak to your doctor about lowering your pressure for awhile. Even if that means your pressure would then not always be enough to deal with all events, stopping therapy altogether (due to bloating pain..and it sure can hurt!) would be worse, imho. Better that the doctor lower the pressure for awhile until the person gets more used to breathing on cpap without swallowing air.