The critics are a force of nature you can't control, but the gatekeepers -- agents and editors -- you have to deal with.
I've sat in on workshops where agents talk about being bombarded with waking-up openings and dream openings, to the point where they have become an automatic reject. I've also seen this mentioned in agent blogs.
The only reason you don't see more waking-up/dream openings in published books is because of what I just described. Most get weeded out.
If you absolutely, positively must open with a character waking up from a dream, then make it the best, most compelling dream opening ever written. Make it matter. Having a character who wakes up scared from a dream she can't remember doesn't qualify.