Spinning metal disk

My friend refuses to believe what we do in our dream state has any significance... I disagree but she asked a valid question that I don't have an answer for.

Laura: hey, I keep seeing this sort of spinning metal disk thingy in the top right corner of my vision
Laura: Only in the dark and only when I am settling down to sleep (this is while attaining a WILD)

Does anyone have any clue why she sees this? Thanks!

Once random imagery that she's now expecting to see each time she WILDs I would think.

That's helpful, just something she expects to see. Thanks for the input!