I don't believe DART runs that time of the night. We've taken DART many times over the years and had some issues due to competition running late etc. and we're unable to take DART as planned because they quit running at 11:00 pm. We discovered also that there is one downtown sketchy station (I don't remember the name) that is best to avoid late at night. Even if your train station near your hotel is good, if you have to switch trains you'll have to get off at a station to switch. Just pay close attention to the stations surroundings if you have to switch trains late at night. You will usually have a few options to choose from. Otherwise, we love taking DART. It's nice and convenient and seems a very safe way to travel. Dress warmly. It can get a little chilly wearing a cheer uniform at the station waiting for your train (depending on the weather of course).