Waking in the middle of a dream, even the worst, one feels disappointed, cheated of the best in life. But pleasant, fulfilled dreams are actually as rare, to use Schubert’s words, as happy music. Even the loveliest dream bears like a blemish its difference from reality, the awareness that what it grants is mere illusion. This is why precisely the loveliest dreams are as if blighted.

Minima Moralia
Theodor Adorno