During bloom, a lower humidity will help trichome productions -- this is good stress. After you cut it, you want lower temps than when growing... slow evaporation = good buds.
An extended dark period isn't needed. It's better to cut the plant before the lights come on - since you control that, you can simply unplug them the night before you harvest. Wake up whenever, it won't matter to the plant or yield at that point.
the idea is to avoid photosynthesis and it's products / byproducts. Believe it increases sugars? ther's a biological reason and not some hocus pocus.
People that believe an extended dark period helps their plants likely are burning off trichomes with too much heat or light and seeing that bounce back as they remove the actual problem they are causing. The darkness is not the cause of the increased production.. it's that they aren't evaporating it off like crazy with junk or misused equipment.
Look up ed rosenthals wrte up on drying / curing... it's all you need to follow. i'm sure he doesn't represent the science 100%, but i am sure he is basing off of information from people with ph.d.'s