In addition to the works of Lewis Carroll and Philip K. Dick already cited (and my own stories, of course), the following books are all good candidates for the "dreampunk" label. While each item may not fit the bill 100%, I've tried to select works that have the right sort of aesthetic and deal in some way with the internal/illusory/mystical world of dreams.
The Dreaming Jewels, by Theodore Sturgeon (1950)
The Dune series, by Frank Herbert (1965)
The Dream Master, by Roger Zelazny (1966)
The Lathe of Heaven, by Ursula K. Le Guin (1971)
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Dreampunk is a sci-fi/fantasy subgenre that asks the question "Is this real?" and then follows up with "What does that even mean anyway?" Alice in Wonderland would be the prototypical example, but any anti-authoritarian investigation into the nature...