I've always had a lot of trouble with lucid dreams. I've been trying for months and I've had two, simply out of sheer luck. However a few nights ago I was able to induce one by accidentally waking up in the middle of the night. My brain was still mostly asleep so it was easy to slip straight into a lucid dream. Admittedly it was short lived but I'd love to do it again. It would be even nicer if I could induce these subliminal wake ups efficiency. I tried setting a short sound to go off on my phone three time the next night. I slept through the first two and the third woke me up too much (plus the alerts were a pain to set). Perhaps I could train myself to awake naturally? But I'm a heavy sleeper and my sleep schedule is far from consistent. Any ideas?