I've had that same experience many times...usually also during a string WILDs as you describe. It's just a part of SP, and hypnogogia...it occurs in that trance like state in between lucids. It is strange when it happens, but I've gotten used to it. Some people think it has to do with OBE or AP or whatever...but...I seriously doubt that. Though, I'm open to whatever. I have experienced this enough times to realize that it's just a state similar to being hypnotized.