Sigh. The last three night trains have all been 4-6 hours late, which really cuts into the arrival day!
Tardiness seems to be a bigger problem in North India (at least in my experience).
So be forewarned – don’t count on swooping into a city in the early morning on a night train, then sneaking out again that night on the next one!
Update: my last (6-hour day) train left and arrived on time! (within 3 minutes)