Yes Elleise-
I've had both the sinking to one side and the sinking in. I do not know what either means.
Furthermore, I have had that dream where you are being sucked into something, a dark hole or something. Then, I decided to scream for the person next to me and there is nothing. With all my might, I struggled and awakened only to discover that I was still asleep. So, I worked really hard to awaken once again.
Wish it hadn't frightened me so bad. I think there might have been something good for me on the other side of that.