On long flights (6h+) I’m always having a hard time with dry nose and upper parts of throat. It stops me from falling asleep and gets worse when I’m trying to lie back in the seat.

Are there any good ways I could improve the situation? I’ve tried drinking a lot, but it doesn’t help much – I just get dry from breathing, regardless of overall hydration. I’ve also tried some vaseline in the nose – which helps a little bit, but deeper in and the throat are still very dry.