I do not have the condition but I do sympathise with you. Are there not CPAP machines with their own on board power supply? Whilw working as a nurse I seem to remember transferring patients with CPAP machines which required no external power.

For those who are confused, CPAP is a machine delivering a constant positive airways pressure to assist those who, in some cases, have a tendency to stop breathing while asleep.

Regards,

kev35