Dreamspace

"It's a vast and fascinating place. Everywhere you turn, a part of you."

- Ethan Rayne

 was a place with the conglomeration of all of an individual's possible dreams.

All individuals were constantly dreaming every possible dream, even while awake. So, as a part of the brain stirred that brew, this resulted in the individual's dreamspace. Which images and thoughts one chose to remember was based on their own wishes and anxieties.

Access
Among an individual's own dreams, the collective Slayer memories and prophecies were shared in this place as well. Notably, the Slayer Melaka Fray didn't have them in her dreamspace, as her twin brother, Harth, received these visions instead.

Through magic, it was possible to one access the dreamspace of another. While Buffy Summers was trapped in her own, Ethan Rayne was able to manifest himself in this place to advise her, even seeing some of her dreams. Similarly, Willow Rosenberg saw Amy Madison's nightmares about her mother Catherine, and used this fear against her.