You should try focusing on finding ways to establish habits that result in higher awareness your life and the state of consciousness you are in. Establishing a solid routine of it is work towards the development of the skill most critical to in facilitating lucid dreams. After I joined the Army my life had reached a point where I was in the same situation as you, with no real time or energy to invest in LDing. I still don't really now that I've finished serving and work an 11 hour night shift at a factory close to the town I ;ive in 4 days a week. I suppose I have an extra long weekend to try things out, but I'm so drained that I typically do little more than sleep the entirety of my weekend away as it is.

Despite that, I still regularly have between 55-90 kucid dreams a year, yet I don't put any effort into actually trying to LD at all. Whether or not I have LDs doesn't really matter to me so much any more, they're simply very pleasant gifts I receive at random and typically in large bundles at once. Not only do I feel like I appreciate them more, but the reason I still have them is because I've found a way to integrate the habit and practice of maintaining higher degrees of conscious awareness simply as I go about living my life, with that being the goal in itself. I've not only learned to appreciate my lucid dreams more, but my non-lucid dreams as well.

Really, my experience with dreaming as a whole is much more fulfilling and holistic. Rather than divide the dreaming experience into semi-arbitrary classifications of non-lucid and lucid when considering, analyzing, and appreciating my experience of them, I view whether or not I'm aware of the fact I'm dreaming as merely part of the experience of dreaming as a whole. As a result of perceiving the dreaming experience this way and regularly maintaining a higher level of awareness as I go through life, the Lucid Dreams that I still get all the time (I actually had two of them just two days ago) happen regularly all on their own as a natural consequence of this. On top of that, it fits perfectly with my lifestyle and current life situation.