Welcome Trixie. I posted the following on your other, same, thread, and have now moved it here.At this point I take it off as I CANNOT go to sleep with it on
I can think of one suggestion offhand: start out during the weekend, and don't take your mask off - even if it means not sleeping all night long. At this point, you're building a habit of "I have to take off the mask in order to sleep". That' easy to build, and hard to break. (It's called "avoidance learning").
So, if you do want to ever sleep with the mask on, you have to build a habit of "if I'm in bed, I wear the mask".
If you have to take off the mask, get out of bed, go to another room, do something quiet and relaxing, and return to bed only when you can put the mask on again. You have to be very firm about that: "no mask"="no bed".
Your husband was lucky to find adapting to the mask so easy. Many of us (myself included) slept less than before in the beginning, you're not alone in that, and don't let it worry you. Someone once wrote that she was "prescribed this new way of sleeping" - and that's what it is. A new way of sleeping.
Good luck!
O.