Green spotted puffer rolling into a ball

Question

can some please tell me why my little green spotted puffer keeps bending his tail back the the side of his body into a ball shape everynight?

Answer 1

That is how they rest....also Marc,  a man from wetwetbmedia (I asked the same question)  told me that they tend to do that after they have eaten to much too...It is a normal behavior.  

Answer 2

Hes just trying to get some rest my guppies stay at the bottom of the tank resting on the sand everynight!!!

Answer 3

Sleeping?