Do snakes yawn?

[RoyalGuardian]

all snakes gape to realign their jaws. <_< Though people say its not for a psychological reason I beg to differ. I have seen Cali do it when she feels relaxed or tired. She will "yawn" then rest her little head and for lack of a better term slither into slumber. I know that their subconscious is deeper than most give them credit for because I myself have made both my snakes yawn by yawning at one point or another!