Why do Gila monsters play dead?

My first encounter with this behavior was many years ago when my best friend saw the Gila monster in its cage upside down and unmoving. He called in a panic and said that my pink lizard (his reference of Gila monsters to this day) was dead. Of course when the cage was opened the lizard sprang to life and was quite aggressive upon examination. Now that I have a group of Gilas, I see this behavior often. Above are a few examples of what this looks like.

I wonder why Gila monsters do this. Is it to thermoregulate different parts of the body? Does it aid in digestion? Maybe its like having restless leg syndrome and they just can’t get comfortable! This behavior is bizarre, but I must say that Gila monsters are quite interesting and they do some funny things I have not seen other reptiles do. I think a book on captive behavior alone would be a fun read!

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