I can only offer up a little grow fact. I know that within a hour or two before the darkness begins plants start to drop and sag preparing for there (sleep) cycle or down time. Now an hour before lights on ,they are up at attention as if they have morning wood. gearing up ready for the day. Dont really think it is a bad thing. Show you have a strict light cycle which the plants know very well. If they look healthy other wise. i wouldnt do anything drastic. a pic might help the better qualified ppl to help you.:thumbsup: