He's a lovely kid, mostly polite and friendly, can be quite serious and emotional but not many tantrums. He seems hyper, constantly - running from room to room, hand flapping, making loud meaningless noises, doing a bloody annoying fake laugh all the time and totally ignores anything I say when he's like this. So we end up shouting at him just to get his attention and things have become a bit negative, not helping his morose tendencies. His peers seem less like coiled springs, more willing to listen, and less prone to making the odd noises. The preschool say his concentration is above average. All of this is worse when he's tired (he's chronically tired as not a good sleeper although we're making progress with addressing this). Is it within normal limits, this stuff?