I have used CPAP for over 30 years and it's never improved my daytime drowsiness despite also taking Modafinil. When I use it for a long period I feel worse and come off it for as while. I use a Resmed Lumis 150 with a nasal mask and a humidifier and have tried all mask types. My sleep is monitored by the NHS who inform me there is a significant reduction in my apneas but I don't feel any improvement. My wife finds CPAP reduces the snoring but this is replaced by hissing and gurgling noises but I can't understand why the data is is not impacted by these noises. When I use CPAP I wake up with heavy catarrh and I am sometimes woken by what seems like something snapping at the back of my throat. Its difficult to to describe but it feels like there is an air blockage despite the reduction in apneas. I would be grateful for any of your thoughts