Try a couple new, different masks. I have some that are much more hot and restricting and awful than others. Or they even have these "mask hacks" items sold now which expand the area inside the mask, still "Safe" but where you can breathe. There's a mask that gives me panic attacks after an hour, and a couple that are easier on the ears and breathable which I could do for an 18 hour flight, no problem.
Or be a particularly bad person and book first class and once its night and you're in your own dark pod, put a blanket over your head and then take.... oh nevermind
