Baltimore is not a cruise ship. Restaurants work on the concept that there is a profit to be made or else they don't stay in business. Getting labor to work late night would be more expensive than during the day. One would have to put the restaurateur in an area they could be certain that it would draw a crowd. Even Sip & Bite is no longer open in the wee hours. So there will need to be some location and incentive to be open.