OK so there was one droney one with a sort of oscillating rhythm, it was quite melodic noise. I was listening on headphones and the sound was bouncing from one ear to the other, but then it started to go through my body and make a weird undulating thing happen.
And then I started thinking back to last night's aphantastia thing... And for some reason I linked that in my head to a village I drove through today, it had temporary traffic lights, and I had this idea that everyone in the village is a fantastic.
Now I can't sleep boo hoo.
It was a hypmagogic thing I think