Deep trance.., not sure what happened

[Ima-chan]

So I was in a deep trance and then I felt my eyes start to roll into the back of my head and my mouth began to open (widely). I couldn't tell what was going on but I felt..some type of pressure on/in my mouth..and I could not move for a long time. I felt other things that I can't really explain.. This has never happened any of the other times I've gone into a deep trance..does any one have an idea of what might have happened?