Strong Hypnagogics.

Ok, I awoke the other day from a dream, forgot all about DEILD, sat up for a few seconds, and laid back down. Within a minute, I started getting insane flashes, normally being faces of people, in different colors, going VERY quickly, like your life flashing before your eyes. It's a seizure like scene, and it seems like I don't even reach SP before this, as I can move my hands and stuff.

I also find myself in an unfavorable position when in here, like in some spot, worrying if I fall asleep, my circulation may be cut off in that area, so I move and lose it.

This has happened twice so far, no attained Lucid Dreaming.
Any advice?

focus on the flow of images and impressions that come to you as you relax and with your eyes closed.

relaxing is key here.

when you see something that catches your liking - a face, or color, a scene barely formed, try to hold on to it in focus. If you manage to hold the image with your attention you will be able to follow-it into a full fledged dream while knowing your are dreaming.
move gently into the sequence - try and not focus on your body as you should from step one - relaxed your body already.