Dd3[8] does have stims such as throat clearing, finger clicking and lip licking which come and go depending on her stress levels.
In the last couple of years she has developed a very loud seal like cough, it starts if she has had a cold [so probably starts off genuine] but can continue for up to a month after the cold has gone.
I have taken her to the GP many times, she has never had a chest infection and it is not Asthma [ we have tried an inhaler].
All fairly normal you say, but when she is occupied she doesn't cough, when she is asleep she doesn't cough!!
At the moment she is coughing roughly every 30 seconds or so.
If we say stop coughing it gets worse.
So what do you think clever people ?? ... I am beginning to think this is a stim but how can I be sure??