Sorry cant help you there H.. My dB still Hardly sleeps and often calls me at odd hours for him Over here.. Dont think there is à solution as i know several adhd who just dont sleep much.,
Think its just part of their condition but maybe Nicole might have some light to shed..cOnsidering she has à child with adhd and there are Surely new techniques or not.. Who knows..
So many nights dB used to get up and cook to eat at an ungodly jour or get up and watch Tv.. À few times hé too thé car for a ride.. Hé had sévère adhd and still has but finally at 30 odd hé has learnt to calm down à bit
Stay strong.. And keep him active during thé day which im sûre you already do..