My 6 year old has just been diagnosed with obstructive sleep apnea, after us looking at her tonsils and noticing they were huge after reading that sleep apnea has a link to ADHD on here (I can't find the thread now).
She has many traits matching inattentive ADHD, practically all the ones on the list. She is going to have her tonsils out and I'm hoping it will help. She's exhausted every morning despite having a full nights sleep, prone to meltdowns, goes hyper often. I've thought for years that it may be ASD/ADHD.
I don't know if it will help many, but just wanted to post this in case it helps anyone else. There was a doctor (Christian Guilleminault) who specialised in obstructive sleep apnea.