The MILD technique was developed by Stephen LaBerge and used by him to induce lucid dreams at will during his Ph.D. study. MILD is practiced during the night.
1. Setup Dream Recall
Set your mind to awaken from dreams and recall them. When you awaken from a dream, recall it as completely as you can.
2. Focus Your Intent
While returning to sleep, concentrate single-mindedly on your intention to remember to recognize that you're dreaming. Tell yourself: "Next time I'm dreaming, I want to remember I'm dreaming." Try to feel that you really mean it. Focus your thoughts on this idea alone. If you find yourself thinking about anything else, let it go and bring your mind back to your intention to remember.
3. See Yourself Becoming Lucid
At the same time, imagine that you are back in the dream you just woke from (or another one you have had recently if you didn't remember a dream on awakening), but this time you recognize that it is a dream. Look for a dreamsign--something in the dream that demonstrates plainly that it is a dream. When you see it say to yourself: "I'm dreaming!" and continue your fantasy. Imagine yourself carrying out your plans for your next lucid dream. For example, if you want to fly in your lucid dream, imagine yourself flying when you come to the point in your fantasy that you "realize" you are dreaming.
4. Repeat Until Your Intention is Set
Repeat steps 2 and 3 until your intention is set; then let yourself fall asleep. If, while falling asleep, you find yourself thinking of anything else, repeat the procedure so that the last thing in your mind before falling asleep is your intention to remember to recognize the next time you are dreaming.
~from Maat's book of Shadows