There are things people to do help increase dream vividness (how memorable the dream is after waking), such as drinking a glass of apple juice before bed, taking vitamin B6 supplements, or even eating some chocolate.

If you're the type of person who wakes up naturally in the middle of the night, try staying in bed with your eyes closed, trying to think of stuff that you may have dreamt about. You can even try thinking about past dreams, and see if anything comes to mind.