She was probably looking for an app to take notes (written or voice) several times throughout the night and then edit or transfer to her 'dream journal' sometime after she gets up for the day. I used to do something similar: I would wake up several times a night and write down key points of everything I could remember about my dreams and then later during the next day I would write them out in more detail in a journal. As for why: The more you do this the better you will become at remembering your dreams. If you do this for a while you should eventually be able to recall half a dozen dreams every night in great detail. It makes the 1/3rd of your life that you waste sleeping far more interesting. Plus it is a basic requirement for lucid dreaming (controlling your dreams), which is what I was interested in.