I've heard some very conflicting information regarding the effect of lowering the house heating thermostat at night. On one hand there are academic papers (such as Thermostat strategies impact on energy consumption in residential buildings, Energy and Buildings 43 (2011) 338–346) that mention "significant" energy savings. There's also https://campusops.uoregon.edu/utilities-services/energy-conservation-myths that confirms the idea.
On the other hand, there are back-of-the-envelope calculations such as http://www.ahok.de/en/night-set-back.html that tend to minimize the effect of night setback.
So which is correct? Does lowering the heating thermostat at night (by, say, 5°C) really help save energy?