How do you manage daytime somnolence without a clear cause?  

I recommend light therapy in the morning, more exercise during the day, and judicious use of caffeine.

Throw a broad net out for the evaluation because we don't know how much has a physiological component and how much is mental/emotional.  At intake, I get a moderately comprehensive set of labs. Rating Scales like HAMA, HAM-D, PHQ-9, Epworth Sleepiness Scale, and a ROS (Review of Systems) are d...

Great question, but I doubt many of us have really concrete guidelines we follow. Here is what I would consider: Are they fishing for stimulants? Just need to rule this out first. I am assuming routine sleep study, and you coached them on sleep hygiene. I am also assuming labs were okay? CBC, ...