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MotP. Plane is called Dream or Dreamscape. Also the source of the Lucid Dreaming skill.
Originally Posted by Emperor Tippy
By level 20 though, you aren't capturing a wizard. A character lives to level 20 by being the most ruthless, lucky, capable, and paranoid bastard around. A wizard is throwing around a 30+ Int score and has, entirely in character, planned contingencies for his contingencies. He may well be running around with flat out total immunity to harm, he does not walk outside without an entire bevy of defensive magics around him and enough magic items to buy himself a nation.
The plane of Dal'Quor is also a dream dimension that exists in the Eberron setting. Information about it can be found in the Eberron Campaign Setting book and a bit more information about its denizens can be found in Secrets of Sarlona and Magic of Eberron.
There's not much, but in addition to being in MotP and HoH, there is a slight mention of a "Dreamscape" in the Epic Level Handbook. It's only a small thing, but there's an Epic monster that can weave nightmares, travel to and from the lands of dreams, and I think can send others there as well. There is also an Epic Level spell that takes you there, kind of like an Astral Projection/Shadow Walk effect.