Hi Fisher Bob,
I am very new to Drop Shot, but have been fly fishing salt for many years an have had extremely great success fishing into the dark, I am sure that drop shot will be just as succesful, when I fish at night I use a very dark fly, so I am sure if you use a bait fish imitation u will have the same success, targeted fish Springer, Rock Salmon, Kingies etc.
Hope this helps.
Peter