Several non-REM lucids?

Well, I went to sleep as usual at around 10:10 p.m. and did a quick RC. I fell asleep and quickly fell into a non-REM dream. I'm not sure how I became lucid, but I was at school in a class, and suddenly I just realized I'm dreaming. The dream was very hazy and I didn't have much control. The dream ended in seconds and I woke up. I immediately went back to sleep and had several more of those all in a row. Finally I was getting annoyed and just wanted to get some sleep until REM, so I turned on the light and looked at the time. My clock read 10:31.

Anyone else have this experience? I didn't even know it was possible to have several lucids in 21 minutes, much less non-lucid dream right after you fall asleep.