Had my third vivid LD - false awakening?

[Puffin]

I took a nap at approximately 4:15 today, hoping to WILD, but I fell asleep before I could feel any signs of SP or get any HI. I was counting (1, I am dreaming, etc) but then my mind wandered and I fell asleep before anything could happen. I became lucid in my dream nearly immediately, though. I was in a tennis court and I even did three reality checks for fun - I tried to put my hand through my other palm, but it didn't go through, so I just tried with one finger, and it did. It was pretty vivid, and my dream didn't even require any stabilization or clarity improvement. I also looked in a mirror, fully aware of the possibility of being disturbed of what I may see, and saw myself normally. I also looked at my hands - both had six fingers. =P I also closed my eyes for a second and imagined myself in my school, and it worked. I also turned around, expecting to see three of my friends coming around the corner, and I saw them. I even remember what they were wearing! Must have been the apple juice I drank that night... The only problem is, at the end of the dream (which was pretty darn long, by the way), I saw a soft white light and I said to myself, "aw, the dream's ending?" I was swallowed up and I found myself in bed, lights off, etc. I tried to DEILD by staying still, but then something wierd happened - I got sleep paralysis, almost a tingly feeling, and then suddenly my body jerked into a position 90 degrees to the left, and then jerked another 90 degrees seconds later, as if I was having a bunch of really crazy hypgognic jerks. Then I thought, "ugh, what's going on?" Then I really woke up. I made sure by doing a reality check. I'm not sure if this was some whacked-out form of WILD, or just a coincidence. Any advice or explanations for this?