Yes, having a dream journal really helps. 
Have your DJ and a pen near your bed. When you go to sleep, repeat mentally something like: “Tomorrow morning, I’ll remember my dreams”. That’s autosuggestion and it works very well. Then when you wake up, don’t move! The first thing you have to do is thinking about your dreams. Don’t think about anything else. Once you have recalled your dream, then write it down on your DJ, even if it’s just fragments.
3 days aren’t enough to see big improvements, but it will be better in a week.