Night takeoff in a rural area exposes you to the possibility that you might unexpectedly encounter a lack of sufficient lighting to maintain visual reference. The other possibility is that you might encounter a false horizon illusion.
Without an AH and instrument proficiency, you are up the creek without a paddle.
In FW it's commonly taught to stay on instruments after liftoff at night until you have 500'. By then there's usually enough lights on the ground and perhaps celestial for visual orientation.