Down the Rabbit Hole (5e)

This adventure is for 4-6 heroes of 1st level, for a one-shot adventure for 5th Edition. (Though this may take more than one session to complete). What was this place? Everything seemed different. And was this a dream? The last thing Arthan remembered was falling asleep, and now he was in this strange place. And why was that rabbit with the watch staring at him like that? The heroes find themselve…