Once I was babysitting and when I picked up the kid he was very, very quiet (=unusual) in the car. By the time we got home (besides it was really, really hot that day) he didn't really answer anymore and I was more than concerned (when you are the babysitter it is not any easier). I asked him if he was feeling sick and/or dizzy and he said yes. He had a bad headache as well (he is 6 by the way) and although he was quite hot he was not sweating at all. I just called his mom as I didn't know what to do.. But other than those parents mentioned above she wasn't concerned at all. I told her that he is fainting and I couldn't even hold the phone.. I mean.. he is 6. The mother just said she will come home (which meant more than 1 hour waiting as she works at the other end of London) and I shouldn't worry "he'll be fine" So I just took him into the house, put off his cloths and tried to keep him cool while giving him water and juice. He had a temperature of 39 and you couldn't really talk to him it even got worse. At the end of the day he had to go to hospital the following night because the mother phoned NHS direct and they might have told her so. He had a really bad heat stroke and I myself would have called him an ambulance in the first place but well, I wasn't allowed to!