Use the wake back to bed method

Set your alarm to go off in 4.5, 6, or 7 hours after you fall asleep. These are the times that you’re likely be in REM sleep. When you awake from the alarm, write your dream down, and stay awake for about 45 minutes. Eat a snack or walk around during this time to get your conscious mind active. After 45 minutes, head back to bed and concentrate on the dream. As you are drifting off, tap your fingers in a rhythmic pattern to keep your mind focused on the original dream until you fall asleep. After all of this it is way easier for your mind to decipher between dreams and reality.