Wake up and re-write

Whenever an editor or agent is lured into listing the things which put them off a manuscript, it seems that well up the list is a novel which starts with someone waking up. And top of the list is the subset of these which start with the protagonist waking up with a hangover or a head wound. "But - but - but -" thousands of aspiring writers cry, and they have a point. What about The Metamorphosis, just for a start? Indeed, the unrevised version of my new novel began with someone being woken...