On my first Disney Magic cruise, I brought a 3-prong extension cord. I plugged in the extension cord by the television, and routed it across the curtain rod between the halves of the stateroom. The cord then came down to the CPAP on my nightstand. The cord was a nuisance and looked ugly. At least it wasn't on the floor, so nobody tripped on it.
On my second Disney Magic cruise, I brought European-to-American 3-prong plug adapter, which I bought at a local luggage store. (The adapter has the round prongs that are used in France and Germany, not the rectangular prongs that are used in the UK and Ireland.) My Fisher & Paykel CPAP can automatically adjust to 220V or 110V. I moved the bed away from the wall; I unplugged my nightstand lamp, and plugged my CPAP into the 220V plug using the adapter; I pushed the bed back. The only problem was that I no longer had use of my nightstand lamp.
On my next Disney Magic cruise, I'll bring a European 220V power strip. I'll be able to plug in the CPAP and the nightstand lamp. No extension cord. No inoperative nightstand lamp. Perfect!
Just two warnings: First, 220V elecricity is more dangerous than 110V electricity, so be careful; make sure all connections are tightly seated and that you never get your hands near the prongs when you're plugging things together. Second, although the stateroom hosts/hostesses do a great job cleaning, their vacuum cleaners do not seem to reach the area where the nighstand lamp plugs are located (normally hidden); under those circumstances, it was still surprisely clean (but not perfect).
