Stress

They only move when I am not directly looking at them.

That last one is moving really fast though. lol

IDK if they are going fast or slow but they make my head hurt!

Ok here goes...

I saw them moving very slowly, barely moving.

My 6 year old son said they weren't moving at all. (In fact he said "I Need glasses cause I can't see them moving" lol)

My 4 year daughter said she could see them moving slowly.