If I remember correctly, this was not written by a mainstream author. The cover was mostly black-and-white, showing an Asian-style drawing of a garden with the gazebo, some mountains in the distance, etc.. The plot was basically of a man that went to sleep and awoke in this gazebo in another "time/world" and what happened to him there. I sort of remember that there was a spiritual feeling to the story - almost religious - but it's been a long, long time so I could be wrong about that. I feel like he was treated as if he was a god in the "new world" where he woke up.