I would like to add the following as a night rating (qual) instructor
I found it a good drill when the instructor flipped the master switch off without warning :-)
Personally not something I would do - night flying in a single engine is dodgy enough without adding to the list of things to potentially go wrong. The alternator is probably working its hardest keeping the battery charged with all the lights and equipment that are operating. The same effect can be illustrated by switching off the panel lights which is on the UK night syllabus.
I personally never fly at night with less than a quarter moon.
Why ? The principle of night flying is the same regardless of how much of a moon there is. What happens when the quarter of a moon becomes obscured by cloud whilst out flying? However, I do acknowledge that there are different levels of darkness !
Do a full simulated engine failure.
You may find this prohibited at many flight schools. Certainly all the schools I teach at PFLs, EFATOs, stalls etc are all forbidden after official night.
Treat every such flight as an IFR flight.
Night flying in the UK is IFR.