Somnambulence (basically sleepwalking) has many causes. During deep sleep, the brain responds to delta waves. Anything that increases delta waves can increase sleepwalking.
This includes genetics, delayed maturation, stress and overtiredness, and medications are some of the usual suspects. I personally have known many people who never sleepwalk, subsequently sleepwalk when using Ambien which is sleep medication. My thought is that ambien increases the deep sleep delta waves which increases the likelihood of sleepwalking.
So the causes are many fold, but they all have the basic mechanism of increasing deep sleep delta waves.
Snakes usually indicate massive change of an emotional, spiritual, physical, financial or relationship nature is taking place. This is because snakes are one of the few animals to completely shed their skin. So dreams use change as a metaphor for significant change in your life. The major change snakes reflect means that these dreams are often what Carl Jung called "big dreams."
Also, a snake is a creature and creatures are associated with instinct. So it is usually essential change that is taking place. The number of snakes and/or the size of the snakes usually indicates how big the change is.
The behavior of the snake often indicates what kind of change is occurring. If the snake is aggressive and biting you, it is aggressive change that is occurring. If you are being bitten, but not being harmed, the dream is usually indicating that you were going through stressful change but that it will not harm you in the long run, etc.
Some snakes take on a peaceful and almost beautifully sacred appearance. A dreamer I had in therapy dreamt of a golden snake who would look back at her as if expecting her to follow him out of the house where she was living. She was living with a man that was emotionally cruel to her. The snake was urging the change of leaving that situation.
On the other hand, snakes can be deceptive especially if the dream is making a play upon the words “snake in the grass.” One might want to remember that the snake in the garden of Paradise did not give good advice to Adam and Eve. This is another way of saying some changes are good and some changes are harmful.
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Why is this image of lightning striking a tree so impressive? It is because of the meaning of the different elements of the image in dreams or in our subconscious. Lightning is electric fire.
Fire subconsciously is registered as change because fire changes matter into energy. Lightning is dramatic fire or fire on steroids. Lightning is dramatic change that occurs instantly.
Trees unconsciously are seen by the mind as an image of integration since the tree opens to the sky, goes underground deeply and is here on the level with us. So a tree represents growth and integration of the three levels of the mind representing, respectively, the superego, the unconscious, and the conscious mind. It is almost always a positive sign when trees enter the dream scenery.
So a healthy tree being struck by lightning means that dramatic and instantaneous change has occurred which is integrative to the person. In other words, it is almost always good news although it is certain to stressful. The rapidity of the change is dramatic and affects the whole person and these transformative changes are likely to be positive although the person going through it is likely to be disoriented trying to adjust to it. Even good change takes a person some time to adapt to it.