[TeMPOraL]

> For my little brothers it seemed like half the school suddenly had ADHD

ADHD is simultaneously overdiagnosed and underdiagnosed; the case of your brothers' school could be the former, or correction of the latter (or both).

> mostly the kids who would in the past have been described as lazy, which I find hard to believe to be based on actual neurological differences

ADHD manifests as laziness to observers making snap judgements, so this actually tracks - turns out, some of the specific symptoms that, in the past, would make someone branded as lazy, are actually a disorder.

The problem with calling people lazy is that it's a moral judgement, which sometimes may be helpful as a form of corrective social pressure, but absolutely does not help when "laziness" is a result of a disorder like ADHD; it only makes them suffer that much more.