Thought I would weigh in here on the OPs question. When you have a cold, one of the first things the doc will tell you is to use a humidifier. As long as you have a humidifier on your machine, you are doing well following their orders! I came down with the cold from hell the Saturday after Christmas and it took me a few weeks to get over that, but it triggered an acute asthma something or other (limited attention span when they go on like that!). For the cold I used Nyquil every night after the first night. The first night I knew I was coming down sick because my machine just made my throat raw from the air blowing down there all night. Took Nyquil and it coated my throat and that went away. Any thick syrup type thing would probably work as well. You just need something to coat your throat, but using my machine actually allows me to breathe better at night than during the day! Of course once I went to the doc and he dx the asthma thingy, I got real drugs so nothing was really a problem! But, to my 2 cents, I always use my machine when I am sick. I want to get the best sleep I can to kick the illness as quickly as possible! When you go off your machine you begin adding back up to your sleep debt. You body uses a lot of energy to fight illness. Put the two together and you will end up sicker, longer if you are off your machine, in theory. But, I was sick as could be and it did not turn into bronchitis nor pneumonia! I attribute that to using my machine to get a good level of humidity! Like I said, just my 2 cents.
As always, YMMV! You do not have to agree or disagree, I am not a professional so my mental meanderings are simply recollections of things from my own life.
PRS1 - Auto - A-Flex x2 - 12.50 - 20 - Humid x2 - Swift FX
So, just to post an update. I have gotten over most of my cold and am now back on the machine (for two nights now). The first two nights back were amazing. Looking at Sleepyhead results I found my AHIs for both of those nights were sub 1.0. I don't think I have ever been there before. I will be making a one night trip out of town and when I get back will be doing the rearranging I was talking about (including the new mask, filter, and hose). The only time I felt sleepy was yesterday afternoon when our oldest cat curled up in my lap and went to sleep. You do realize that a sleeping cat is highly contagious.