I'm a new grower myself so I only have limited knowledge. I know plants can show that sort of droopieness when they're overwatered. Do you have perlite in your soil to aid drainage?
I bet Stinkyattic would know what it is, she's a ganja-guru. She ain't been around for a few days tho. Maybe if you fill out the sticky at the top of this forum there'll be a few clues