SmethwickBelle I feel your pain - DS is exactly the same. He had the most horrendous year in Reception - for exactly the reasons you described. It was nothing major - just bouncing around on the carpet or making silly noises.
The school has a 'golden time' system that simply doesn't work for DS. You start at the top of the chart at the beginning of the week and lose golden time for behaviour issues. No way to earn it back. DS would usually be half-way down the chart by Wednesday. The problem was that it was no deterrent for him - he is just too impulsive. Three minutes of time on Friday means nothing on Monday morning when you can be bouncing around and singing rather than listening.
Unfrotunately, his teacher just would not accept that there was any other 'tools' available to her other than the implementation of a rigid school behaviour policy. Behaviour did not improve one iota over the year and DS came to see himself as naughty (his words).
What used to really upset me was that, when meeting up with friends and their children, DS' behaviour was usually as goood as or better than his peers. His EYFS scores were also low compared to what I know he was capable of based on the fact that he just didn't bother to engage in activities at school.
Anyway, Year 1 started in exactly the same pattern. Fortunately, his teacher this year is excellent (in my opinion). She is strict and with a no-nonsense approach and very quickly identified that the school's behaviour system was not working in changing his behaviour. She quickly identified the key 'problem' times for DS - usually transition between one activity and another. She has found strategies for dealing with this that work. Having broken the 'naughty boy' cycle, DS is working really hard in school and his written work has visibly improved over a very short period of time - as has his self-esteem. His last levels were really good, and a much better reflection of what he is capable of.
The key thing I would urge you to do is to put pressure on the school/teacher to find out what they are doing to change/manage his behaviour rather than creating a negative spiral. If you don't feel you are getting anywhere with his teacher then escalate the matter to the KS1 manager. I was urged to do this last year by another member of staff at the school but didn't (and I regret this).
The other thing I would recommend is that, if you feel he is being treated harshly, don't follow punishments at school with further punishments at home (eg withdrawel of treats). I always wanted to feel like I was supporting the school, but as the year progressed I felt that they should have been doing more to manage the situations. It was the only way I coud help to build up his self-esteem again.
Lastly, lack of sleep definitely did not help in his behaviour. When I see behaviour/concentration starting to deteriorate at home/swimming, bedtime immediately comes forward by 30 minutes. It makes a hell of a difference.
Good luck with the parents' evening.