DS1 has been acting up for a few weeks - he is very tired, and bad behaviour like this is usually related to not being well. I put this down to end of term tiredness but he's still tired and the new term has started. He is 5 and goes to bed at 6.30 pm and wakes at 6.30 am. I've noticed that his tonsils are very big but they don't look pus-covered as they do when he has tonsilitis (he gets this a few times a year). Any clues as to what's wrong?