Im just gonna copy and paste what i wrote in another thread because i don't fell like writing it again. Lol
Well harvesting at night does infact make your buds taste and smell better. chlorophyll is produced during the day as photosynthesis occurs. the plants break down sunlight and nutrients and turns them into energy for the plant. if the plants are cut during peak photosynthesis the chlorophyll will be abundant in the plants stems leaves and buds and produce a very grassy like smell / taste. during night hours chlorophyll production is halted. it makes sense that 72 hours of darkness would infact degrade all active chlorophyll in the plant and allow for the plant to taste much better. I always give my plants atleast 24 hours dark before I chop but try to give them 72 if I have time and patience enough.
Never heard of THC being active during the day ... kinda doesnt make any scientific sense at all really.