A lucid dream is any dream in which you are aware that you're dreaming.
But is being aware, all there is about lucidity of ones dream?
We spend around 6-8 hours a day sleeping. About half of that time is dreaming and there's only 2 hours of most vivid stage of dream.
There are many questions about the evolutionary reasons for dreaming.
Perhaps it has something to do with memory . Something like disk de-fragmentation on your computer.
But what about Lucid dream? Does it have evolutionary reason? or is it just the side effect of human brain progress.
This is very interesting video about LD