This doesn't answer your question, but here's an experience I had with lightning about 20 years ago.
I was in bed, half asleep, watching tv when there was a gigantic noise - all my phone lines lit up and the phone rang (due to business we had the old style 6 buttons across the bottom with hold). I picked up the receiver with the hand my watch is on, no one was there of course (after that, my watch - which had always run a few minutes slow - was in hyper time, gaining 15 minutes or so an hour!)
My tv blew out. Any weirdest thing of all was that both toilets began to run constantly. I got up to 'giggle' the handle of one which didn't stop it - I took off the lid and the chain had gotten looped over the arm. After I fixed the first one, I heard the other running. It had the same problem!
Even though those events seem unrelated - it all happened in a split second when the lightning must have hit the house somewhere.
Who knows what would happen to a cpap!