why does my chameleon yawn/hissing?

[jurjenfromholland]

this morning my chameleon woke up..
and was little bit grumpy.. he is always grumpy..
in the morning.. just like my girlfriend
but further from that he is awesome! its a veiled..
but when i wasnt even close to his cage he couldnt see me..
i heard a hising sound.. and a yawn after.. do all chameleons do that?
or...?

 

[Tannervan20]

Is your cage glass? If so he might see himself in the reflection and get pissy! But other than that my veiled sometimes gasps in a huge breath of air... I'm sure it's normal though!!!

 

[KingJulian]

I read somewhere that it's typically normal for them to yawn in the morning, so unless he's showing other symptoms, he should be ok

 

[Riktor Scale]

I would see how often he is doing the hissing noise and yawning. This could be a possible sign of the start of a respiratory infection. Not trying to scare, yawning is completely normal. I would just try to see if the hissing happens every time he opens his mouth, also look for stringy/gooey saliva.