One thing that kept me a wake with using the dreamstation is the slight whine of the motor going up the tube into the mask. I love the easy breathing with the dreamstation but the noise bothered me. A few night I couldn't sleep with that dreaded slight whine noise. I am a very light sleeper and wear earplugs normally to block any noise I hear. When I wore earplugs with the dreamstation the earplugs just amplified this noise in my head.
A engineering friend had a look and said the noise is the whine of the motor going up the tube through the air up the tube and into the mask. What I needed to do was divert and disrupt the air flow which should cancell out most of the noise. We got a 330 ml plastic drinking bottle put the hose connection in the hole where you drink from, cut out a round hole 90 degrees on the side of the bottle and join another small hose to my mask (amara view I have so it has a hose lead anyway). Tried it and it worked at least 80% of the noise is gone. I also tried with small milk carton it worked also.
Took it recently to the sleep physician and he laughed, and he said if it works why not. He measured the pressure the other end and it only dropped from 9 cm to 8.5mm and he said we just readjust for the difference.
The only thing is you have the drink bottle in the bed with you, but it certaintly helped reduce the noise that kept me wake. At least the noise is a lot better and now its just trying to get use to CPAP.
I hope this helps someone else who may have a similar issue with noise going up a tube