Dixiechick, I think you may be right with that. His Reception teacher said the first term of Y1 would be a gentle intro and it would kick in in Jan. I asked him if there's less play now and he said, "We get 1 minute of playtime!"
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...yes, I think I will ask teacher for quick chat after school tomorrow, mostly just to see whether it's got a bit more intense at school, as my Dad is here to watch the little ones. The difficult thing is that at school he will probably play up more than usual, but not to the extent that they really notice it as loads worse - with all the other kids there are in the class. As his Mum, I can tell he's not 'quite right'.
Don't think it's beginning of term. He's usually more relaxed/ more energy at beginning of term. We had a very rough Spring term in Reception too...so I am a bit sensitive to it and getting a bit stressed myself as we struggled so much from this time last year until the last half term of the Summer term. It turned out there was lots going on socially, but I never fully figured out what set him off.
The kids he looks up to are all very advanced (inc. his best 'friend', who is not always very kind to him), so I think he does feel it. I am torn between letting him chill out after school, and doing stuff to help him catch up to them = so am trying to balance that. He's really 'bright' but in different ways, he's very imaginative, very creative and sensitive, but it takes him a lot longer to 'get' things than other kids.