I have an idea for a book.

Hello all. I have always wanted to write a book. I have an idea for a book to write and get it published. I want to write a story about a woman named RebeccaAnne who has seizures only while sleeping. During the seizure, her spirit goes into another dimension and she lives one day in the seizure life and her boyfriend in the real life is alive, but during the seizure, he is dead. What are your thoughts?