I failed a WBTB WILD last night/this morning. But I'm confused on what stage I was in, I'll describe what happened.

Got up 6 hours later
Lied on my back, this took awhile, longer than I wanted, and at one stage a sound above me (was really weird like a squelching noise) made me open my eyes for a second, but I closed them straight away. Very soon after doing so my body went into SP I think, got a weird wave over me and my heart started getting faster and louder (because when I go into SP I dont get enough oxygen) so I increased my breathing, deeper and my heart calmed down to an extent where I couldnt hear it at all. Then I was in this stage I felt very comfortable but nothing happened, I sat there for about 10 minutes without any sort of sign of progress, I was expecting a noise or an image, but nothing, so I took my chances opened my eyes and... failed.

What stage was I in after SP, becuase I didnt seem to progress when I expected I should have. (was it opening my eyes early on and I hadnt even realised how deep I was?) Is there any techniques to transition easier, I did attempt to "imagine" myself rolling over, but it didnt convince me.