There's a good chance of it. Hypogogic hallucinations would have followed, most likely. I get rocking sensations too, and hynogogia always follows, for me. But they're so scary I usually back out. The sounds are so real, and I hear footsteps and creaking doors . Just remember they can't hurt you... good luck to you!

Oh yeah, and focusing too much on the hallucinations can bring you out of a WILD attempt.