it might be that your soil is overheating the next day, after you water your plants at night the soil is still wet and when sun hits it all day it has ALOT of heat my soil temps were 50+ degrees celcuis(i was freakin out), so what i did was replaced my soil, covered my soil so no sun could get in it and heat it up anymore and now all the leaves are taking full sun. put some nutes on it earlier and it is looking alot healthier and starting to grow alot faster now. this might be an issure for alot of growers that do not realize that the soil should not be getting the sun. this iinsures that you can get the maximum sunlight all day needed for amazing plant growth and not have to move them in the shade when it will not alow for growth, when it could be getting that extra few cm's per day.
GOOD luck