...running out of juice, mismanagement of the fuel system, loss of control following structural icing...
Those three can be brought to a happy ending by executing a forced landing in a field. But only, if you have the chance to select one.
BTW: I did the mandatory night flying for my own license (was ten hours then). Later I did a little instructing at night too. But once I reached 50 hours single-engine night flying (a purely arbitrary value!) I called it quits. Never again. But any time in anything with more than one engine.
You are fortunate in that the "JAA IR = FTO" monopoly, at an eye watering £450/hour, gives you that option
I wouldn't call that fortunate. Otherwise, I simply wouldn't do it. And if I look around my instructor colleaugues, there are not many who would. There are easier ways to earns one's living than instructing...