I have tried various approaches already with ds (nearly 4) such as showing him how they work, trying to normalise their presence in his world and pointing out similarities between hand driers and fans (he is ok with the latter) but to no avail. he will suddenly run into my arms several times during the day for a cuddle saying 'i am frightened of hand-driers' - it is as though he can hear them even though we may be at home or another place where none exists. if i ask him whether he can really hear them or if he is pretending he will admit to "pretending" but there is real fear in his eyes and no laughing afterwards to indicate that he was joking. i dont know if he is just seeking reassurance because he is feeling insecure or wether he has a sensory problem for which he needs therapy - i was wondering whether anybody could point me in the direction of self-help tips/techniques. he is not asd as such but did have some speech delay from 2-3 (though has since caught up).