Strange plant behavior

Hello, first time posting here. Not sure what the problem is, the branches curve downward about 5-6 hours before lights go out then back up by morning. It's been doing this about a week now, and appears healthy otherwise. I have a 180w led 24" from the top, is this because I'm using the veg and bloom switch? The other plants look ok, and I didn't see anything like this in my first grow. Can't find any info if this is some sort of light stress, and I'm not sure if I should be worried. Any advice is appreciated.

To me it sounds like the condition in the grow is causing the plants to lose water at a rate faster than the roots can replenish it. Ive seen this happen with some outdoor stuff before. A few things can cause this. Undeveloped root ball, water soaked roots, dry soil, to much heat from the light, or a fan blowing directly on the leaves (but then they would continue to droop at night). I hope this helps. Good luck

Thanks for the response, it makes sense. I transplanted them from party cups 4 days ago, and that was 4 days after I knew they needed it. Had to water every day since they were drying out so fast. That's probably it but I'll keep watching it.

Sometimes plants just droop before the lights go out. Sounds weird but it happens haha. What's the RH/Temp. like in your grow area and how much aeration did you amend into the soil? Perlite, Lava Rock, etc. If the plant's are losing water faster than the roots can uptake water, than your temp's are probably a bit too high. Either that or the root mass is compacted within the soil and is having trouble with consuming water. I feel like it could just be your plants getting accustomed to the light cycle. I, personally, wouldn't do anything until they start showing further symptoms but i'm not an expert either haha. Good luck brother.

Yeah I wont mess with it and see how it deals with it. Aside from the horizontal stems it looks like the healthiest plant. My guess is that it was a little pot bound, and underwatered. Then shocked by the transplant and just grew into that form. Temp is usually 70-75, rh 50s with a humidifier less than 30 without. I also used 2 cups of perlite per gallon of soil. Thanks for the help, still learning alot here. Much better at smoking than growing. Maybe it's just a self training plant.

Looks dry to me. Not surprising after transplanting. Whenever my clones droop I get scared and foliar only water twice a day for 2 days and they perk up. Never forget to water them in after transplanting. Purpling stems is common in clones due to stress or Ca/Mg def