What was that????

Today I slept 13 hours and could remember 3 dreams. One of them, the second one, was very short but nearly lucid. I saw on my clock and it was 6:30, and I have to wake up at 6... and in this dream someone was in my room and tried to wake me up, but at this point I knew that this has to be a dream, because I was sure it has to be earlier. I then lost the image of my clock and I think I was half wake the whole time. I then turned my head and looked at the clock and it still was 5 o'clock. My question is, if I was awake all the time or ... if it was some kind of "mixed state of mind", because I had no problems to turn my head after the image of the clock disappeared.