obstructive sleep apnea/hypopnea syndrome
"I'm finally getting 8 hours of sleep with significant REM.  Having regular dreams for the first in decades (67 yrs old).  Plenty of energy.  ADHD symptoms, including: focus, short term memory, social interaction, feeling of well being, and a general calming effect have all improved dramatically.  For about 5 years I took 60 mg/day of Dexedrine but had to stop due to blood pressure issues.  Basically the same results without the side effects."