Atlanta traffic on a Saturday morning?

Atlanta OG'rs-

Driving south to Orlando and I've got a couple options based on timing. Wondering what is best based on others' experiences.

Do I do everything I can to get through ATL in the middle of the night or would I be ok to get a decent nights rest in Chattanooga and leave around 6am to drive through ATL?

Any major construction to be concerned about? Phone Post 3.0