I Was Recently Prescribed The Antibiotic Levoflaxacin And Have Used

I was recently prescribed the antibiotic Levoflaxacin and have used it 4 days now- I also use a CPAP machine. In the past few days just as I am beginning to fall asleep and drift off I am hearing very strange sounds such as off key music (almost very "evil" sounding at times) and this stops immediately when I "snap to" and become alert; It also happens when I am asleep and begin waking up and seems to be in the ear that is lower to the mattress when am sleeping on my side... Is this anything that sounds familiar or that I should be concerned with?