In my early LDing days i have practiced this extensively and in my case it was like a subliminal thing. Sometimes, while i was doing it i felt like i really was going to LDream that night. It was a feeling from inside, but whenever i had it i always had a lucid dream that night. If i remember correctly, the way i did it was to simulate multiple times that i was becoming lucid in waking life. So i cultivated awe and curiosity which i believe to be key for LDing