Breakfast is included with these Nightjets, although it's pretty minimal (two rolls with butter and jam and a cup of coffee or tea). On the plane I got a sandwich with awful bread and a single thin slice of cheese in it.
The train is also an exercise in waiting, since there are about 4 hours before and after it's bed time. However, it's not so much time lost, because you have a fixed space and don't have to move around so much like on an airport, so it's easy to open up a laptop and get some work done.