Lucid Dream Triggers

I have always wondered how these rare (for me at least) dreams happen, and I am curious to know about what causes other people to have dreams such as these. My dreams are triggered by close observations and facts. Ex. I am on my street in a dream when I think about how beautiful the leaves are on the trees. Something doesn't seem right. Then I realize that it is really Winter and there are no leaves on the trees and that I am in a dream. Then I am able to do what ever I please. How are some of your lucid dreams triggered?

My lucid dreams are usually triggered by some sort of dangerous scene that really would not happen to me in real life. One time I fell out of a gondola that was carrying me up the mountain and was holding on by a small plastic mesh material and when I finally got to a ledge to get up on, a rattle snake was there! This is where I realize I am dreaming and I just fly away:)

Im not quite sure but when i watch alot of scary movies and such before going to bed or middle of the day. Then i start getting dreams but i ain't completely aware am i dreaming but i have been doing telekinesis and other stuff in them. not sure if it affects but i convince myself before going to bed that theres a disfigured scary person in the closet etc.. I remember then dreams too..