Do you wake up multiple times during the night, naturally? Or do you remember two dreams upon awakening in the morning? Try telling yourself before you first fall asleep, "I will wake up after every dream and write it down." Focus on recording each dream immediately after you have it, not all at once in the morning.

You should naturally wake up after every dream for a split second anyways (unless you are on weird medications, or have a chemical imbalance in your brain). The problem is, most people don't recognize this split second of consciousness. Most people just immediately fall back asleep.