How About Some Examples?
Here are some books and series that fit the genre really well, even if they weren’t all written with “dreampunk” in mind. I’ve tried to select works that deal in some way with the internal/
White Light
The Dark Tower series
Hard-Boiled Wonderland…
Snow Crash
The Sandman series
The Vurt series
The Newford series
Fight Club
Neverwhere
Perdido Street Station
The Scott Pilgrim series
A Monster Calls
The Darkening of the Light
Letters to the Black Underground
Storm Dreams
Hoodoo
Jerusalem
The Roam series
The Strange the Dreamer series
The Soul Sleep Cycle
Urban Gothic
The Gay Wizard series
The Mirrors series
Steggie Belle and the Dream Warriors
Mirrormaze: A Dreampunk Anthology
White Light (1980) by Rudy Rucker
The Dark Tower series (1982–2004) by Stephen King
Hard-Boiled Wonderland and the End of the World (1985) by Haruki Murakami
The Sandman series (1989–1996) by Neil Gaiman
Snow Crash (1992) by Neal Stephenson
The Vurt series (1993–1997) by Jeff Noon
The Newford series (1993–2004) by Charles de Lint
Fight Club (1996) by Chuck Palahniuk
Neverwhere (1996) by Neil Gaiman
Perdido Street Station (2000) by China Miéville
The Scott Pilgrim series (2004–2010) by Bryan Lee O'Malley
A Monster Calls (2011) by Patrick Ness
The Darkening of the Light (2012) by Tessa B. Dick
Letters to the Black Underground (2016) by Yelena Calavera
Storm Dreams (2016) by Jeb R. Sherrill
Hoodoo (2016) by Ronald L. Smith
Jerusalem (2016) by Alan Moore
The Roam series (2016–2017) by Dez Schwartz
The Strange the Dreamer series (2017–2018) by Laini Taylor
The Soul Sleep Cycle (2017–2019) by David Michael Williams
Urban Gothic (2019) by Stephen Coghlan
The Gay Wizard series (2019–) by V. S. Santoni
The Mirrors series (2019–) by Sonya Deulina Williams
Steggie Belle and the Dream Warriors (2020) by Elias Pell
Mirrormaze: A Dreampunk Anthology (2020) edited by Cliff Jones Jr.
Next: Dreampunk in Film