_Sky . . . thanks! i'll google it. my sleep apnea isn't so serious. (my bro has sleep apnea and would rattle the windows from his gasps for air and snoring. i barely snore but stop breathing for short intervals about close to 100 times a night. the air pressure on the CPAP is set very low.) i know i'm minimizing here. you're right, not using my CPAP can be dangerous for me/others when i operate a vehicle.