So close!

[Hunterkiss]

I just tried a WILD nap. After about 30 minutes, I felt the onset of transition. The blackness behind my eyes widened, I felt a sensation of spinning, and my heart started to pound. This has happened before but usually only lasts a few seconds because I get excited. However, this time I stayed calm and it lasted a couple minutes. I tried to visualize and feel being on the beach at first but nothing was changing so I just laid there and stayed passive. After 2 or 3 minutes, first the spinning slowed, then my heart slowly returned to normal. I usually experience these kinds of things on my back (which I was) and sleep paralysis if I'm on my side (vibrations, ringing, mind imploding feeling, etc). Either way I have trouble getting into the dream. Any advice for transitioning from here? I have gotten this far multiple times but cannot seem to get past this. Thanks