ADHD stimulants appear to work less by sharpening focus and more by waking up the brain. Brain scans revealed that these medications activate reward and alertness systems, helping children stay interested in tasks they would normally avoid. The drugs even reversed brain patterns linked to sleep deprivation. Researchers say this could complicate ADHD diagnoses if poor sleep is the real underlying problem.
edit here is another article
https://medicine.washu.edu/news/stimulant-adhd-medications-work-differently-than-thought/



Well it’s a good thing we make our kids get up at the crack of dawn to get to school. /s
It’s so annoying once you realize society intentionally forces children to learn at inopportune times because one of its main jobs is daycare. Doesn’t matter that delaying school by a couple hours would likely (only a correlation at this point) improve kids’ grades and overall well-being, that would mean impacting their parents and their jobs.