Before going (back) to the airport, you could give my absolute favourite dining and wining place in Ddorf a try. It's located in the "Little Tokyo/Seoul" area of Ddorf in Immermannstrasse near the main railway station.

Cafe Relax is run by youngish Japanese who are serving very tasty fusion dishes, homemade cakes and other bakery produce and mixing up interesting drinks plus having a reasonable wine and beer selection available.

Should be open at least 1am on weekday mornings. Music is provided.

http://brickny.com/cafe-relax/