Why does my auto sour diesel droop 2 3 hours before lights out

Pretty well normal for some strains, they get ready to protect their flowers, it seems, by lowering their leaves before sunset, when most of the pest bugs come out. (That's my theory, and the only one that makes any sense to me!) It generally happens more so with plants with a higher % of Sativa genes in my experience. Strangely, some will also have their leaves up and ready in the morning, well before light. There is no "too much light amount cut off mechanism" in cannabis plants. Running your lights at 24 hours will lead to unhealthy plants due to an incomplete photosynthetic cycle, plants need dark to undertake certain processes they can not do when the lights are on. Without "sleep" plants suffer from an incomplete metabolism, besides, nothing on planet Earth has evolved to be able to survive without sleep periods every 24 hours, it is called a "circadian rhythm". Please do not fall into the trap of trying 24/0 thinking somehow you will get better plants, you won't, just exhausted plants with a screwed up metabolism and I can't see how a plant with a screwed up metabolism can produce healthy trichomes, or healthy anything for that matter! Besides, cannabis can only grow so much during any 24 hour period and this growth tops out around the 18 hour mark, meaning that running your lights longer than 18 hours is basically a waste of electricity. 18/6 has been advocated for for 40+ years now and is not a random number, but a conclusion drawn from 80+ years of research into cannabis. Hope this helps, Organoman.

Hello. I've read in gardening books that sunflowers will droop their leaf's down if they don't get enough food. In the spring, in my greenhouse, my plants drooped too until they were given a big dose of food or nutrient solution. That is my advice, give them a big meal and see if that is the problem. Chuck.

I can’t answer why, but i noticed this to be quite common with the handful of autos I ran in the past. Even did a question way back about it. I don’t think it’s anything of concern

I run my lights 24 hours, I can see them rest during the day and perk up a lot at night. There always there happiest early morning when I get back and feed or add water to the res/soil after work. ( I work nights and sleep during the day, were in sync lol ) Watch your plants, learn there schedule and what they like.

Plants can only take in so much light, they will start to rest after they take in there maximum amount. Your plants will also droop if you give them a dark period. They adjust to a schedule and know when lights are about to go out.

My temps are at 26 lights on and about 23/24 lights off pH is all correct humidity is at 52%

Without a pic of the plant is hard to say. Maybe it’s too hot for your plant, also the soil start to heat up and in case it will soffocate the plant