yes your soil it self may already be packed with nutes,everytime you water you release the nutes once the water mix's,and yes I agree with the dude who said go 24/7 i always use's that time chart for new seedlings and clones,well you said they fall over and die when you wake up right! maybe it's during the lights out that the cold is coming in more so do to the lights being off?.............anyhow good luck