As mentioned by the authors, the causal relationship cannot be answered by this study. But if you want to recall your dreams more frequently, I highly recommend keeping a dream journal (also mentioned in the link). In my teenage years I went from remembering an average of a dream per week to vividly remembering 3-4 dreams per night. As soon as you wake up, immediately start writing all details you remember. Whether or not this increases your creativity in the waking world, it's fun to see what your brain constructs while you're asleep.