Sounds like intelligent fish to me,my clown loaches snuggle in a small cave at night and sleep on their sides! Honest engine! 

I would have to agree. My puffers are by far the smartest fish I have ever kept. They have great personalities and they have learned to tell the difference between who enters the room! They will not pay attention to my wife or child, but if I enter the room they are up at the front of the tank watching everything going on.