Night 4 on CPAP and for the second time since starting I was finding myself not breathing? It's like I was having to remind myself to breathe. My breath has been very shallow also. There are times I wonder if the machine is even on and have to open my mouth to make sure. I have the Mirage Micro nose mask. I thought maybe I am just getting used to having air blow in my nose, but the not breathing?!?

Sleepyflyer without any data available sounds like you may have central apneas.  When I was first diagnosed with SA I went thru the same.  This occured mostly at the time I was about to fall asleep, my breathing would stop and I would freak out and pull my mask off.  I went back to my Dr. and told him about it and he requested another sleep study.  Then he requested I get a bipap,  which I used for about two months and still would stop breathing with the bipap.  This time he requested a ASV titration and I am waiting for yet another machine.  This time I am getting a bipap auto SV.  I will post what happens when I get this machine, hopefully by next week.  I hope this will help you.  You must tell your Dr. what is happening and never give up.  I was first diagnosed with SA in Oct. 2007.  It's been a long and bumpy road.  But ultimately it is up to you if you succeed in your tratement not the Dr. of the R/T.

I also had the issue of stopping breathing, I use a ResMed bipap auto SV, and if you stop breathing it will make you take a breath.  It is a really great machine once you learn how to use it, i'm on my 3rd machine in 2 years, the first had a "alarm" problem and was replaced the first week, the second was fine, when my insurance provider changed equipment providers they gave me a new machine, newer model and it is even better.  The new provider tried to give me a respironics mask, but I had to go back to a ResMed Quattro.  One issue is that the "film" that touches your face has to be washed daily or it becomes oily and then leaks air.  My solution was to get 4  of the inserts for the mask (expensive) and I wash them every 4 days.  If oily they leak when you stop breathing and the machine forces more pressure to make you take a breath.  The down side is I'm slightly claustrophobic so I take a very mild sleeping pill, Temazapam 15 mg, and I sleep thru the night.  The mask makes a slight noise so sometimes I use  foam ear plugs.
It has taken me 2 years to learn all of this and get to the point that the machine is not an "issue", give it some time and experiment.
Be prepared for your equipment provider to totally unfamiliar with the machine.  Even the sleep clinic was learing how to use the machine when I was there.
You may need a humidifier, which is an attchment that slides into the machine, not seperate.  I have to use it in the winter as I live in Palm Springs where it is very dry in the winter.
By the way I have Central Sleep Apnea.
Good luck.  Jim