Well, I duly gave J half a cup of black coffee this morning. Firstly, don't count on an oppositional child to be predictable... He was obviously happy when I told him he was a big boy now and could have some coffee. But it didn't make any difference in terms of drinking the stuff - well, fair enough, and he is SO fussy about what he will eat and drink. I, however, am just as (alas) "fixed" as he is on certain things and having got it into my head that I wanted to do the coffee experiement today, I duly got him to do it, with some difficulty. Anyway... not only did it not have any calming effect, he was HYPER hyper all morning - took him to his usual Wednesday morning session with the pscyhomotricien and his first comment was "J is very speed today!" He was really spinning. So I don't think that I will be giving him coffee on Saturday... On the other hand, in the car back home he was very quiet and concentrated for half an hour, writing numbers and letters on a new writing board I had just got him. He may be like that anyway - they tell me he is like that in class at school. But he obviously wasn't so completely hyper that he couldn't concentrate on anything. So I don't know whether this tells me that stimulants would probably have no effect on him.