I was lying there in the dark completely still and after a while that high piched sound you hear when its quiet started to turn lower to it was like a deep bass.

then i felt a slight pressure on the hole front of my body.

after that i think i noticed my swallow which caused me to be pulled out to just lying there all in all it took about 10 minutes i think, but was this the start of entering SP? if i hadn't been dissrupted by my swallowing, would i've entered SP?