weird shrinking sensation

When I was much younger, probably around age 11-12, there were a few nights where I had vivid hallucinations in my bedroom. It was very dark, and I was sleeping on a futon at the time, so very near the floor. It was a comfortable bed, and I was eating well, sleeping well, and hadn't taken any drugs. What happened was I felt like the room was enormous. It was as if I had shrunk to the size of a pea while everything around me stayed the same. I could've been lucid dreaming, except I moved things around near my bed and they were moved when I woke up. It was disturbing and I felt like I couldn't move. Since then this has never happened, though I think back on it wondering what the hell may have caused it.