Plant in shock, I don't know weather to keep the lights on or turn them off

[DrSeuss]

Did you water them? (over watering might be the problem). And, is it just the leaves, or is it like branches or the whole stem? If you watch a time-lapse marijuana grow video, you will see the leaves droop very frequently, (they kinda rise up slowly then droop really quickly, then rise up slowly then droop...) but they always come back up.