This might sound a tiny bit gross...

I dont know if this is just me personally but as I fall asleep on the brink of going into a dream state, my nose seems to cramp up inside, and all the mucus moves upward, something to do with my sinus's or something.

I never noticed this until I started WILDing, its actually become helpful for me, as it informs me that I'm slipping away into a dream state. Though I still have to be conscious during the process or I wont notice it at all and I'll fall asleep non lucid.