Now might be. a good time to buy an oxygen concentrator if you ever wanted one. they make 1-5 liters per. minute of 90-95% oxygen out of thin air. Enough to run a SMALL jewellery torch. Probably not too safe around a CPAP machine with greased linkages and sparks in the motors and switches.
It may also be a good time to refill your welding oxygen tanks just in case. Again it may also be a good time to buy a gas welding set or at least the oxygen cylinder if you have been thinking about it. The hoses, torches and acetylene cylinder are optional. At least get one O2 regulator to fit the tank. Some folks run propane with oxygen maybe even natural gas.
Bill D