Short answer: WBTB (link)

Longer answer: The recipe for a successful DILD is this:

1. Do your waking practices during the day.

2. When going to bed, assert your intent to wake after each dream and recall them in detail.

3. Wake in the middle of the night after a dream and record it in your journal. Then, as you're going back to sleep, let your thoughts linger on that previous dream, or on a dream you want to have, or anything else that keeps you focused on lucid dreaming.

4. During that mid-night waking, you can remain awake for a while, perhaps 5-30 minutes. This is called wake-back-to-bed or WBTB. This period builds your awareness for the next sleeping period. It's a balancing act though, to build awareness while still allowing yourself to get back to sleep.

5. Go back to sleep. These subsequent sleep periods are the mostly likely time when you will have a lucid dream.

6. When morning comes, record as much as you can about your dreams and activities of the night.

7. Over time, your accumulated recordings, knowledge, and analysis of the process will contribute toward your proficiency. You'll learn what works and evolve your habits.