What is happening?

So my timer is set to go off at 10:30pm and come on at 4:30am everytime I go in my room after around 7pm for some reason 2 of my plants a droopy they are fine all day long and as it gets close to lights out they droop. I dont know if it has something to do with the light or what any help is appreciated.

I am in pure coco I use mills nutrients water everyday till run off light is a 630w cmh

First pic was taken 2 days ago at 3pm everything looked some what ok 2nd pic is from today at noon the plant in the back right is starting to do it now. It has only been happening to the 2 in the front i will post another pic in a few of them because they look fine right now

I was about to say that it's natural for some plants to sort of get lazy when they get close to lights out, but then your last picture is a little more telling. How far is your light from the plants? Are you doing anything to supplement Mg? You mention that you 'water' every day...is that with a feed solution each time? I'm assuming you're checking your pH on your feed and it's...?

Yes when I water I feed everyday light feeding and use cal mag 3ml per gal every watering ph is good I try to stay around 6.2. Could this be a temp and humidity problem I'm in a small room and try to keep the door open when the light is on to move the heat i have a exhaust fan in there but it doesn't do much and when I keep my door open the humidity drops I just bought a hygrometer yesterday and my humidity is at 16 right now

Humidity of 16 is way to low and I keep mine as high as 80 and the plants love it.

I put a small humidifier in my room yesterday and within an hour the humidity got up to 31% and my two plants in the front got really droopy I'm going to get a bigger humidifier

Stop opening the door and get a passive dehumidifier. For a small room it should b more than enough. I forget the name but look around and you'll find them. They hang from the ceiling and last three months before you have to do something with them.