The Temp. goes down to 70 degrees at night. When she wakes up her stress marks are in full effect. Belly dark grey with black circles. By time I turn her lights on and go get her breakfast her bellys starts going back to normal? Maybe I need a night light?
Stress marks is a bit of a misnomer. Dragons will also get darker when they are trying to absorb heat and UVB, so it's normal for a dragon to be dark in the morning before they get moving because they're soaking in the heat to warm up.
70 degrees is ok at night. If it dips below 60 or so, I would look into alternative heating, like a ceramic heat emitter, but don't use one of those 'night lights'. Even the black ones emit light and bother your beardie at night.
You could always get a ceramic heater for her tank. They don't give off light (so it won't disturb her sleep), and they are great in the winter time. Worth a shot!
I bought a heat emitter, 50W, and put it on during the nights I think may get chilly in the house..........works good, but bulb and fixture (ceramic) cost $50.