Wilting at night

so ive got a couple plants that are ten days old and a few days ago i noticed that a couple of them have started to get the claw. at that point i had them in dixie cups but since then i have transfered to 2 gal pots. i actually did this 2 days ago. now my new problem on top of the leaves curling i have two plants that wilt at night to the point where im afraid they arent going to make it but then the next morning after the lights been on for a while the plants straighten back up and arent wilting but they still have the claw. im pretty sure its not overwatering because ive only watered them once in the 2 gal pots and i didnt water untill the soil dried out while they were in the cups. im using a 400 watt mh and fox farms happy frog soil. my temps are a bit high in the grow room so im thinking maybe heat stress. if thats the case then how can i fix it. i have the light at just over 2 feet now. i had it down to 18 inches but i raised the light when i saw the claw. any ideas?

anyone have anything for me?

some photos and more details would be good. foxfarms soil is a little hot from what I've heard, is there any burning at the leaf tips? do you adjust ph before you water?

no there isnt any burning and and im using distilled water.. everything is nice and green its just the curl on the a few of the leaves while the rest are drooping. and then after the light goes off they droop to the point where it looks like they are wilting. ill get pics up soon.

i couldnt get any pics up but im thinking that its probably mainly stress since there arent any signs of nute burn or def. and im pretty sure ive watered correctly so ive decided to use some molasses in my next watering to give em a little kick.

hows your ventilation and temps and humidity at night maybe try keeping the air moving around at night so you don't have hot stagnant air just hanging around in your grow area all night

they might be going to sleep. do they sag just before lights out and stay that way until a half hour after the lights come back on?if they do it could be normal.

your plant are sleeping the curling (claw) could be too much N maybe (hot soil)? mine wilt when the lights off and there very healthy indeed im no expert thow....