About two weeks ago, I woke up at 6am, went to school (college), and fell asleep in a chair at 8am for two hours. During that time, I experienced a lucid dream (that I unfortunately didn't take advantage of) and awakened sleep paralysis.
The lucid dream involved me still being asleep in the chair, only I never opened my eyes. I had only had two hours of sleep the night before and I was sick, so I didn't want to get up or break rest even though I knew I was asleep. I simply wanted my mind to "stop." I only realized that I was dreaming once I realized there were voices of people behind me that would not be there normally. I suppose you can say that's what triggered the lucid dream.
Not long after, my mind started waking up, and due to the unique circumstances of my surroundings (sleep deprived, the flu, people talking around me, TV on, ping-pong game) my mind was awoken but I couldn't move my body. I just sat there with my eyes barely open trying to speak, but I was totally incapacitated. My mind eventually fell back asleep and I woke up about a half hour later.
I had the strangest feeling upon awakening, and I asked a few people around me who had been there to confirm my lucid dream. I sat for an hour just trying to take it all in.
Crazy stuff, man.