The original Dream series is collected into the following volumes:
The Dreaming: Beyond the Shores of Night: Collects The Dreaming #1-8.
The Dreaming: Through the Gates of Horn and Ivory: Collects The Dreaming #15-19 and #22-25.
Simon Spurrier's books are collected in three volumes:
Pathway's and Emmanations, issues #1-6
Empty Shells, issues #7-12
One Magical Moment, issues #13-20