Attention lapses due to sleep deprivation due to flushing fluid from brain

Could ADHD be caused by a broken flushing response? Lots of flushing followed by intense focus caused by the tabula rasa?

I suppose it's possible, but it seems less likely to me because ADHD is a life long neurodevelopmental disorder that shows [visible physical changes in the brain on scans](https://pmc.ncbi.nlm.nih.gov/articles/PMC7879851/). That said, there are statistically more people with narcolepsy who have ADHD, and the same goes for sleep apnea. There's a number of hypotheses I've read as to why, to name a couple: related epigenetic causes, or [possible misdiagnosis](https://pmc.ncbi.nlm.nih.gov/articles/PMC7336577/) (narcolepsy is much harder to diagnose than ADHD if you don't have textbook symptoms). So there is definitely something there.