You could "lose control" of a lucid dream only in the sense that your subconscious mind might take over control of the dream from your conscious awareness. At no point in any kind of dreaming does any factor outside your own mind control the dream. Dreams, lucid or otherwise, only exist within your own mind.
The question probably refers to "lucid dreaming."
a lucid dream is when your aware that your dreaming and sometimes you can control it
In a lucid dream, the conscious mind maintains some level of awareness. The dreamer knows that a dream is occurring and may be able to have some control over what happens in the dream. The opposite of a lucid dream would be a dream in which the dreamer is not aware of dreaming and has no control over what is felt or done in the dream.
By definition, a lucid dream is a dream in which the dreamer not only is aware of dreaming but also has conscious control of the dream. If one cannot stop or alter the course of the dream, one is not actually in a lucid dream. The question describes an ordinary, normal dream in which one happens to know one is dreaming.
Yes, lucid dreaming simply refers to becoming "lucid" or aware that one is dreaming.
The main prerequisite for having lucid dreams is above average dream recall and then you can learn.
Lucid dreaming existed since the cavemen, I know because ANYONE can lucid dream.
When you lucid dream, you can control the dream, instead of just going along with it like in a regular dream. You know you are dreaming, and you have the power to make anything you want happen, if only for a few minutes in your own mind.
A dream-initiated lucid dream starts as a normal dream, and the dreamer eventually concludes it is a dream.
Not much other than that you can control what you want to dream, and that you are one of the few persons who can SOMETIMES, not necessarily always, know that they are dreaming. Some studies have shown that Lucid Dreamers also can know what is happening under anesthesia. Lucid Dreaming can tell you what you want to avoid dreaming, as you change the dream. I personally am a frequent lucid dreamer. It is an interesting experience, and not well studied.
The question probably means to ask about "DILD" and "WILD" lucid dreams. These words stand for "Dream Initiated Lucid Dreaming" and "Wake Initiated Lucid Dreaming." The first refers to entering a lucid state from within a dream while the second refers to entering directly into a lucid dream from being awake.
If you would like to lucid dream, you should start trying to remember your "normal" dream after you wake up. The purpose of this is: If you can't remember regular dreams, there isn't any way you'll be able to remember if you had a lucid dream. All lucid dreaming really is is being conscious of your surroundings while in a dream. If you can realize that you are in a dream while in your dream, you will become lucid. There are hundreds of different ways to learn to lucid dream. The most commonly used one is asking yourself throughout the day if you are in a dream. Chances are, if you do this in your dream out of habit, you will realize that you ARE dreaming, and become lucid.