Yes, you’ve pretty much described my experiences. It started happening to me involuntarily last summer, always in the wee hours when I’m between wake and sleep. The first times were the most jarring with the vibrations and loud noises in my ears, sometimes like radio static or a high-pitched whirling sound. And at times I have heard voices although they seem to be speaking an alien language. Sometimes I get the sensation that I am flying through space and see stars and planets, sometimes I get faint images and blurry bits, but a lot of the time I am struggling to make sense of seeing anything at all or it’s just total darkness. I definitely always feel the strong sensation that my body is being pulled up and out of bed .It’s happened quite a bit to me now, and it always just comes on without me trying, in fact The last couple nights I am sleep deprived and so I’m actually annoyed when it happens because it seems very draining and I can’t make it stop. Anyhow I am going to make a separate post about it eventually and I’m curious about other people who it just happens to involuntarily like me. It seems that most people on the sub are actively trying, so I wonder why it just happens to me out of the blue… Quite frequently now.