I dont know how it is for other people, but my LDs end very abruptly... Pretty much I'm doing something and BAM! gone...

I prolong my dreams by reentering them at the last scene of the faded dream or a location that is very familiar to me and also is my dream sign.

To reenter a dream you just woke up from, you should immidiately upon waking up focus on the last scene of the faded dream and just keep it's image in your mind's eye... Pick a position in the scene where you would reappear and stop all motion in the scene...

Reentering dreams is sometimes tricky, so it's nice to have a specific location that you may use as a reentry point... I use one of 2 classrooms that I had a lot of classes in. Pretty much a dream fades, I imagine that classroom, pick a seat and within a minute I'm lucid in that dream...