Too Much Writing, and Not Enough Editing, Can Numb the Bum

I'm reading a murder mystery by a very good writer, but this particular book is driving me batty. 'Why batty?' you ask. I'll tell you. First of all the editor was asleep on the job. (Not like my second to last editor. She sends me emails when I make typos on this blog. "Thank you Cindy!") When a sentence tells me that a character sat down, or opened a door 'a crack,' I'm thrown completely out of mental alignment when a paragraph or two later the character sits down AGAIN (without having had a chance to stand up first), or opens the door 'a crack' AGAIN. But that's not all. There's a bit too much repetition in this book. It's like watching a reality show where people just live day to day doing ordinary things and not much happens for far too long. We have two murders to solve here! I should be on the edge of my seat but I'm simply thinking, 'get on with it, for heaven's sake!' Now I'm getting worried that there won't be a surprise or shock at the end. That it will fall flat. I read for about three hours solid last night (I told you I'm a slow reader, didn't I?) and actually began to notice, for the first time, that the window seat is harder than I thought, and my bottom was getting a bit numb.
Let's make a note, fellow writers. Never give our readers a numb bum. Or at the very least, they shouldn't notice the numbness.