Originally Posted by
blondeterp
Wow! An old college haunt! I have never been there before 2 am and have never been there sober! And if the OP is going for sightseeing, I don't know what he would be doing up in the Tenleytown area.
OP - I believe the Georgetown Cafe (in Georgetown) is also still 24 hours.
I agree DC is not really a 24 hour town. I'd consider the Priceline idea. Or rent a car to take you to all those monuments and, if worse comes to worse, sleep in it!