I am having nasal congestion every night, possibly from an allergy, preventing me from sleeping because I use a CPAP machine. I would like to know if my machine is at fault in some way and otherwise find out why this is happening and what I can do about it. The nasal congestion has worsened over the past couple of months and I think I also have a common cold at the moment. I am on amoxicillin for a tooth infection as well (since Monday March 2). I brought my machine from Canada and I have been living in Nairobi for 1 year.