3D Objects

What I'm about to describe may sound really bizarre, and maybe nothing like that ever happened to me, and I was simply fooled by my subconsciousness into believing that I actually experienced something like that.

First of all, and this I'm sure is common for many people, the world starts spinning around when I go to sleep sometimes. Sometimes it spins around my bed in a perfect circle, the other times it spins left and right, then immediately up and down. I have this feeling a lot especially during summer, when I come home after a day on the beach and swimming in the wavy ocean. And sometimes it happens during WILD-ing.

The other thing is what I'm particularly concerned with. More than often it happens during the world spinning sessions, but sometimes it happens by itself when I'm very tired, or just for no reason at all.
So what happens is that I'm starting to visualize a small abstract 3D object, for example a cube, floating in the emptiness. I can almost feel how small it is, as I visualize myself holding and touching it with two fingers.
At the same time, however, it appears to be overwhelmingly huge, to an extent that I can sense its gravitational force putting pressure on me. This sounds totally illogical, how can a very tiny object that you barely feel with your fingers be at the same time unimaginably, overwhelmingly HUGE, occupying the entire emptiness it exists at.

After I open my eyes, the feeling of spinning and/or the feeling of Tiny-Huge object are gone.
:?