For a dream to be remembered and fed into short term memory, the dreamer usually must awaken during REM sleep and actively process it. Presumably, this will serve to heighten the dreamer's awareness of internal physiological processes and promote awakening during REM sleep. Immediately after awakening, close your eyes and try to think about what was being dreamt. Often, a 'trace' can be captured. Write the dream down immediately.
Some people prefer to use a tape player to record their dreams.
These questions are to be completed after reading a dream journal entry, or upon recalling a dream.