Yes, such dreams are called lucid dreams. Some people occasionally have lucid dreams naturally, while other individuals put much effort into intentionally becoming lucid while dreaming.
A "lucid dream" is nothing more than a dream in which you realize that you are dreaming while remaining asleep. There is a tremendous amount of nonsense circulating on the Internet about lucid dreams along with opportunities to spend money on useless instruction books and gadgets claiming to produce lucid dreams.> Some individuals are able to become aware that they are dreaming quite easily and direct their dreams just as they would a daydream or waking fantasy. But that does not mean that everyone can or should have lucid dreams.
Absolutely anyone. Although, it does come more naturally to some people than others. Some people have them throughout their lives. I had to work really hard at it, but BOY was the effort worth it! I've had some incredible experiences in my lucid dreams. And even my non-lucid dreams have become FAR more vivid and interesting since I started learning to lucid dream. Just give it a try, and don't give up! You can do it! There are even aids you can get to help you achieve a lucid dream if you're struggling.
Generally, no, it is not possible to control the outcome of one's dreams. Dreams are produced by the subconscious mind which is not particularly responsive to conscious desires. Some individuals learn to control some dreams through "lucid dreaming." However, there is much nonsense on the Internet about lucid dreaming, which is not as easy as rumors claim it to be.
Yes, some individuals are able to lucid dream every night. However, excessive practice of lucid dreaming can lead to loss of natural dreams, resulting in symptoms of sleep deprivation. Natural dreams are necessary for both physical and emotional health.
You can't. I've had lucid dreams at random, even with practice and using techniques that are really good. WILDs have high success rates, as do MILDs, but usually, you can't predict them. After a good bit a practice, and coming up with self techinques, you may "master" and almost always have lucid dreams. But there is no sure way, some people can have lucid dreams at will, but they natrually have the ability.
Dreams are generated by the subconscious mind while the conscious mind rests in sleep. The intention to control dreams (or anything else) is a function of the conscious mind, and the subconscious mind is not likely to pay attention to those intentions. It is possible for some individuals to learn the skill of lucid dreaming, which gives some limited control over nightmares and repetitive dreams. However, much of the information currently published about lucid dreaming is unreliable nonsense and will only disturb normal healthy sleeping. Also, lucidity is anecdotal, and a lucid dream is still a dream. In my case, I'm 55, I have only had one dream that I considered truly lucid and controllable, but that state only persisted for a few moments. All of the other so called "lucid" dreams that I have had, even those I thought to be "controllable", turned out to be nested dreams, where I dreamed that I was dreaming, which tends to invalidate the concept, at least for me, of truly lucid dreams.
There's no limit on how many lucid dreams someone can have. Some people will only have a handful in their life time, others will have thousands. It varies from person to person.
Lucid dreams represent a mistake in the mind - rather like a hiccup - that confuses aspects of awakening with aspects of deep sleep. Instead of the conscious mind being at rest while the unconscious mind produces dreams, when lucid dreams occur, some portion of the mind becomes conscious and aware of a dream taking place. Some individuals experience lucid dreams naturally or with very little effort, while other individuals cannot achieve lucidity while dreaming no matter how hard they try. This is nothing more than natural variation among individuals, similar to the ability to roll the tongue or whistle between the teeth. Neither variation has particular value or significance.
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.
The short answer is no, not usually and not easily. Dreams are produced by your subconscious mind, while your wanting to be in control is a function of your conscious, waking mind. Some persons are able to focus or meditate on a specific subject before falling asleep, and increase the chances of their dreaming of that subject. But how your dreams handle that subject remains in the control of the subconscious mind. > Lucid dreaming is a popular subject and a lot of nonsense about lucid dreaming circulates on the Internet. Some individuals are able to become "lucid" or aware that they are dreaming while the dream is occurring. Somewhat fewer individuals are able to learn to control their lucid dreams. But success requires practice and self-discipline, and has the potential to disrupt normal sleep and the function of natural dreams that are important to health.
There are many places online to learn about the meanings behind common dreams. World of Lucid Dreamin, Dream Moods, Horoscope, About, and Shine all have articles about common dreams.