No specific recommendations, but call a few, tell them you're arriving at DFW on an overnight flight, and see if they can accommodate an early check-in for a weary traveler who needs to rest up before pushing on with his day.
You have recently moved and are returning to the area to take care of some business. Your house is being fumigated. Your in-laws are in town. Hell, just use the same reason you would use if you were checking in at 5. Or just tell them your stay is personal. Or business. Unless you or you trystee gives them some reason to suspect something, they don't care.
Try the Westin Galleria. They have always been flexible for me... Never an early check in and never any questions. I have checked in with nothing but a phone in my hand and the only comment is welcome back to the Westin Galleria.