It’s great to dream! In fact every success in life has to start with an idea. Dreaming is a waste of time, though, unless you are willing to work hard to make your dreams come true!
However, to get on to the writing tip that you clicked here to read 🙂 . . . readers feel cheated if you begin your story with a dream sequence without telling them it’s not real. When your character wakes up and your readers are jolted into what is a new reality, they tend to find it at best disconcerting and at worst, annoying. Nobody likes being led up the garden path! For some reason amateur writers use this dream technique frequently at the beginning of novels (children’s and adult fiction alike), and it makes editors roll their eyes.
So find another way to begin your book – some honest truth and a bit of mystery will help readers step into your story and love being there. 🙂