Background
The protagonist is suddenly transported to another world. This can be by curiosity, magic, force, or any number of ways.
Anticipation and "Fall" Stage
The protagonist is able to get a good look at their surroundings, they find the new world "dreamy".
Dream Stage
Protagonist begins to notice strange and questionable things. Tone and mood being to shift making the reader uncomfortable.
Frustration Stage
Things have taken a turn for the worst. It seems that doom is inevitable.
Nightmare Stage
Somehow, the protagonist is saved and escapes at the last possible minute.
Escape and Return Stage