sounds to me like he is tweeking.. more info would be needed though to be sure.. His pupils will be enormous.. He may even be interested in cleaning out drawers starting a project but get nothing done.. Up at all hours.. If you could give more detail....
Hello
\You may not actually see your son doing drug because us addicts get around every way we can; so make sure you talk to him--look at his eyes and just pay attention to any sort of sign and keep tract constantly.
Personally it sounds just like withdrawal but you can never be sure with anything
best of luck
is he still using meth,i know that when your under the influence of meth or coke,your jaw will move as you described.how old is he and how long do you think he's been using.