It's a hard question. For me, it's been to make lucid dreaming one of the most important things in my life. One of the pillars of my life, really. I realize that when I am not lucid for a while, I feel bad about that--as though I am missing out on the other half of my life. Sounds depressing, but not really. It's allowed me to maintain motivation and keep working at it. If it's really not that important to us, it won't manifest in our lives in any substantive, life-shaping way. We probably won't even remember to check reality.

If you find that your discipline for lucid dreaming is lacking, then take a few moments to remind yourself of all of the benefits of lucid dreaming: sex with beautiful people, hyper-realistic flying, personal growth and development, and otherwise impossible experiences. Remind yourself how awesome it will feel to be lucid in the dream state. And then remind yourself that what you are currently doing (not sticking to a sleep schedule, not doing reality checks, not practicing MILD before bed, not writing down dreams etc.) will not yield the results that you want.