If you are on diabetic meds and you take two at night then two in the morning is that too much...symptoms of feeling slugish?

It may be. : Check your blood sugar. If it is low, drink some fruit juice. Discuss your medication regimen with your doctor.

Depends: It depends upon what the "two" are. Are they keeping your glucose normal? That's what's important. Sluggishness can be a symptom of either too low or two high a blood sugar - plus many other conditions not glucose related.