Why are they doing this

OK so my plants are about 45 days old and about to weeks ago they started dropping but only like an hour or two before the lights go out and they are healthy I just don't understand OK so here are the stats I have them under a 250 mh that I switch to hps when I flip the switch and when my closet doors are closed my temps reach about 85 degrees which I know is not good and when its open about 77 and for the first time last night it dropped to about 60 which I feel is a little to cold I also have small fans surrounding the plants to keep the temps down what could be causing this. any feedback would be great thanks.

Possibly they're drooping 'cos they need some water? Need some more info guy.

its normal, this happens because they no longer need to have their leaves straight up to absorb max sunlight. As long as your leaves are perky and green during the day you are all good bro. peace and happy growing

I've seen these brazillians that open and close like flower petals. It's insane how it would go from x-mas tree shaped to full on burning bush with the sun rise.

lol i know its crazy its like they are obedient and know when its time for bed lol thanks everyone.