Yes, i knew it from my Syrians but since I had my dwarf Poppy she always seemed more restless and alert even when standing still but one day she was out in her play box she stuck one head in a toilet roll and the other half was out with her little feet dangling lifeless, I got so scared I thought she had died, as even moving the roll or stroking her (which she normally doesnt like) did not change anything. When I tried to grab her she was out in a split second again and looking at me as if I was daft
Scary, though, isnt't it? I find it weirder with dwarfs as they are always so quick. I havent seen her doing it since tho...