Oh gosh I have this too!! I have a really nice quilt and cover and everytime I get into bed I have to shake it up. Even in the middle of the night if it slipped down I have to shake it up. My partner always laughs at me and thinks I'm OCD but I can't stand it not being EXACTLY in the cover. I actually just woke my partner up just now doing it as i got in bed.. Will definitely try the clip things..