Thread: The vibrations make me tense up

So I just did my first two WILDs this afternoon around nap time. They both failed. I used the 61-point meditation and spinal breathing from yoga to relax myself and then just left myself drift into sleep using the mantra "I am dreaming." However I encountered a problem: vibrations, usually in the head region, that make my shoulders and neck tense up. My eyeballs were also bouncing around like they were on meth, but the vibrations were really more of the problem. I had times when I felt like I was beginning to float and the pressure in the back of my head would get really intense, then everything would relax and I knew that I had failed.

I'm quite familiar with these vibrations from practicing yoga nidra, which is like WILD but instead aims to induce a state of conscious dreamless sleep. I've never figured out how to get beyond them, however. They always make my shoulder, neck and jaw muscles tense up and I think that prevents me from going deeper. Any suggestions on how to deal with this?