SinisterDezz, I think that is a thing -- going to sleep after being stressed out, and suddenly becoming lucid. In my dream, my wife and I were being roughed up by this group of thugs. I became lucid, and the thugs turned into hatchet wielding zombies (lol). I've also noticed that if I have to get up early (or just at a specific time) to perform some task -- go to work to be evaluated, complete some time-sensitive project, etc. -- I often dream about either waking up and not getting enough sleep, or actually performing the task. Sometimes I can get an LD off of it