Am wondering if ds has this, he makes a strange noise quite a lot, but not when concentrating hard on, for example, tv. He has got to the point where he will 'disguise' the noise by pretending to get the hump and 'strop' so he can do it, or hides it within a word, but I can notice it still. He has a couple of facial tics which come and go, but are much less severe and noticeable than the noise. He is 9. Any advice gratefully received : )