On return to school day, some of the children were very tired by lunchtime. I thought too much chocolate and not enough running around? An experienced person said - no - always after a holiday, a proportion of the children are tired 'cos parents keep them up late during the holiday so M&D get a late lie-in. The children get used to the late nights and late mornings. M&D forget to adjust for going back to school, so the children are knackered on school return. I would have dismissed this as cynical prejudice, except she then said - it will be child J, L, C, D, T, etc, etc - about 2/3 of the class! And she was correct. I thought I was unshockable, but this has left me .