This sometimes happens when you first start trying to Lucid Dream and it is usually do to changing your sleep around, such as how many hours you sleep, or whether you are waking up and going back to bed.. Changing your sleep schedule will sometimes result in less memory but continue trying to get full nights of sleep while still using the methods.. always write down every dream you can remember as soon as you wake up.. Don't worry, your recall will get better, especially if you are sure to write in your journal and get plenty of sleep.