I don't take Cymbalta, but I have had experience with my meds seeming to make me feel more tired. I take my Paxil at bedtime, and things are fine on that front now.
You should bring up the tiredness with your doctor and see what advice s/he has. My doc is very good about
listening and thinking carefully about
when it's best for me to take my various meds.
Co-Moderator, Anxiety and Panic Forum