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Full disclosure, I've never actually seen Melancholia, but from your video, I arrived at a very different interpretation of Justine's character… it occurred to me that, if someone was used to hearing that the world was doomed, and had both ruined their own life with their actions and come to full acceptance of the fact that they had nobody to blame but themselves for their situation, that discovering that the entire planet genuinely IS doomed, in short order and quite demonstrably… wouldn't that come as a great relief? None of the guilt or crises would matter any more, because the advent of Melancholia would be so much more immediate… and since nobody can do anything about it, there would be no pressure to try, no pressure to be "productive."
It doesn't quite meet the definition of sanity in the ordinary sense, but when inevitable doom is rushing towards the entire planet, I kind of think the definition of "sanity" would shift, as values and priorities shift, because most of what we think matters… would suddenly no longer matter.
On a weirder note, I used cosmic bliss-horror when I put unicorns into my original high-fantasy worldbuilding project. In that world, unicorns are fearsome interdimensional incursions that cannot abide the impurity of the world's setting… Mesmerizingly beautiful, but lethal without exception. But they also contain a Mr. Toots reference, because I simply cannot help myself. Yes, my unicorn's ultimate ability is a discharge of superheated, rainbow-colored plasma (B308), shot out of its ass. But it's magical plasma, and when it burns you right to the bone, you fall under the Ecstasy spell (M139) as an affliction.
Who's afraid of the big bad eldritch horror?
And what happens when you're not? We made a video on it!