No offense to FF, but if you're concerned about getting enough melatonin to improve your anaerobic performance then you don't really lift. It's a good idea to cycle melatonin as it is a steroid and there is receptor saturation and feedback issues. It's not a good idea for kids as again, it's a steroid and it does mess a bit with your endocrinology/sex hormones.
No, it's not anabolic.
No, it's not anabolic.