I think a lot of us have the same issue with limited time to sleep, and "needing" sleep. If you really want to LD you will be willing to wake up in the night. The few minutes of time you spend awake will not affect your sleep quality and when waking from a REM cycle you can attempt induction techniques, set new affirmations while awake, and briefly take notes in your dream journal.

I'm a light sleeper and if I avoid lights and only stay awake for a short time, the awakening will not affect the quality of my sleep.