I use a CPAP machine, which you can take camping if you want to--two options--buy a battery pack (expensive), or plug it into a 12 volt outlet using a shielded cable--much cheaper. I have sleep apnea which puts a tremendous strain on your heart and leaves you exhausted through the day. I thought I would never adapt to the CPAP but i did and now i won't leave home without it. It has built in adaptors for voltages in different countries. (You may need a plug adaptor as well) Just get tested for sleep apnea, and if the tests show positive (moderate to severe), get the machine--it will help you live longer
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