Years of training in understanding whatever little we know about ADHD etc.<p>&gt; We&#x27;re talking about the person actually experiencing the symptoms.<p>Yeah, me too. That makes me an expert, right? The fact is, I didn&#x27;t even know until 5 years ago. You can make a qualified guess before asking a doctor yes, but at least here it seems a doctor has to rule out a lot of options, including sleep apnea before he they go with ADHD.<p>Also, as has been mentioned before, practicing d&#x2F;p tend to see a few cases every year and has at least some background to say what is normal and not.<p>All this should be obvious, shouldn&#x27;t it? It is not like anything I have written so far requires huge leaps of faith, no?