It should be noted, as I've seen misinformation about the curfew for the past year, that whilst it is about preventing loitering and being outdoors at night, there is no strict ruling on travelling to and from another location, such as from the sanctuary to the inn.
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I will never be in agreement of adding day/night cycles of closing to the drain. The drain, like many criminal enterprises doesn't sleep. Hoth sure might, and if it is required we could cycle a nighttime or daytime barmen to give him a break but I also think a degree of using imagination is in order. Just because an npc is mechanically there at all times doesn't mean he doesn't take breaks and other people fill in for him. Definite no on closing anything underworld for the reason of a cycle.