In which I record the temperature of my fridge and surrounding environment, and track events that take place involving the fridge, in order to answer the question, "Can I unplug my fridge at night without ruining my food?".

Update: It turns out turning off your fridge is bad for it. Details here.
upstairs, downstairs, outside, fridge door, back of fridge, freezer. Download the data: top, bottom, and event log.
Conclusion: With enough water (or steel blocks) acting as a thermal mass, it is safe to unplug the fridge at night. Meat or fish should be consumed quicker than if the fridge stayed plugged in. Any meat or fish should stay in the fridge for 1 night maximum.