Aspberger's syndrome is really just a very mild form of Autism (not so accurate, but you asked for it in layman's terms). There are operating university professor's who've got Aspberger's syndrome. Essentially it's Autism without Mental Retardation and the severely impaired motor skills.

I've never heard of H.A.D, Im not even sure if it's a recognized diagnosis in the diagnostic and statistical manual of mental disorders. But I know that A.D.D. and A.D.H.D are only related to Aspberger's in that they're viewed as mental disorders.

You may be suffering from adult attention deficit disorder, which is just a.d.h.d that's gone undiagnosed. But if it isn't affecting your career or personal life in a negative way, don't worry about it.

Google Aspberger's if you want the full story.

Many of the neurological and mental disorders can overlap and can be comorbid diagnosis (diagnosis that occur together). This is not uncommon. It is entirely possible to have Asperger's syndrome and have a hyperactive disorder. Do a google search on Asperger's syndrome. There is lots of information about it on the net.