The other morning I woke up to this on the back glass. It looked just like a vine or root system, but it was alive and slowly moving. Up close it was tiny worms all stacked on top of each other and traveling together in this network. When the lights came on, they slowly retreated back into the sand. I scooped some into a cup and they were very fine in diameter, and looked to be part white and part dark reddish / brown color. Does anyone have any idea what these are? I searched around and couldn't find anything similar.