Art and Soul serves dinner at 10pm (and according to OpenTable it's a 1000 point reservation!).
Also check with Matchbox. I've eaten there late before (maybe around 9:30/10pm) but it might have been a weekend.
Zest apparently closes at 10pm, but maybe call to see if that is when the kitchen closes or they close their doors completely.
Art and Soul
415 New Jersey Ave. NW, Washington, DC 20001