It is a good idea not to water during the dark cycle. This is so the roots have a chance to aerate and also so that they will be good and hungry when the light does come on in the morning.

In my experiences it is perfectly normal for the plants to droop at night. They are literally resting. This is so the roots have a chance to grow a little more and so the plants have more energy for the next day. It could also be due to your temps dropping but if anything higher temps will make them droop rather than lower. If they perk back up in the morning then I'd say you have nothing to worry about. Just go get stoned and start thinking of the next thing to worry about. =)
deftdrummer Reviewed by deftdrummer on . Watering times Ok guys i changed my set up just a little bit, i now have jet streams in my tubs instead of a drip system, when its dark i only have the plants watered 2wice, and right before the water turns on the plants look sickly droopy, Is this bad? i mean there still getting water, im trying to see if there getting to much water, but if i take 4 hr breaks off time, there should be no way, i use hydroton and rockwool, the rock wool doesnt even get wet more damp and drys very quikly, when lights are on i Rating: 5