You give the wittiest answer you can think of (which is not very witty, but it's not exactly a sophisticated riddle). "Correct!" your assailant says, "you may enter the forest of dreams." The brush and branches part, heralding your entrance into this vast sacred grove. It's beautiful, and you're content to have this place to stay for a while, but you're a little alarmed to find after staying several long years, that there's not actually any way to leave. You don't seem to age here, either, so rather than continue an exciting dream, you exist through a relaxing eternity.