[sap230]

I have a bearded dragon about 3 years old and aout 16-18 inches long. Recently he has been making a sound that kind of sounds like him blowing air out of his mouth. It sounds like if a human were to be blowing air out of their mouth then blocking their mouth off suddenly with their tongue. It is not constant by any means, only once in a while, usually more than once in about a minute though. I only notice it when I pick him up, and it makes me think that he is nervous when i pick him up, but I am not sure. Should I be concerned?