Mosherd7answered grow question 4 years ago I tried without, with 24 hours of darkness, and with 24 hours of darkness AND a bag of ice right on the soil to melt down and cool.
I do the last one now. No proper evidence, but lots of local growers do it and honestly it made mine a lot heavier and stickier. Maybe its just water rention in the buds and it dries back out, god knows. But I do both now. Lol