While sleeping why we will have a dream?

I have often wondered the same question. I have read lots of studies and the experts disagree on just why we dream. Here are some of their theories: Some say dreams don't really have a purpose; they're just one of those things that seem to happen for no reason. Some say dreams are our brains "twitching." Because our brains are basically huge collections of information, pictures, and feelings, when they "twitch" in the night, all kinds of strange things come out and get thrown into dreams. Some say dreams are a way to process all the events and emotions of the day, and are important to our mental and physical health. It's sort of like when you leave a computer on, it sometimes runs programs to clean up its hard drive. Our brains are always "on" even when we're asleep, so dreaming could be a time for them to do their own version of cleaning up the "hard drive." Other experts say that dreams exist to solve specific problems in our lives. Let's say you give a computer an incredibly complex math problem, and it has to take a few seconds before it comes up with the answer. This could be what dreaming is about, except instead of solving a big math problem, our sleeping brains are trying to solve emotional issues. The stories and images we experience as dreams are like way-out versions of our emotions, and our brains are working through those emotions.

We have dreams because it's what our brains our thinking when we fall into a different zone. A certain part of our brain is still fully going when the other parts are just resting. That's when our visionary comes in during our sleep and take's control. Your only fully running certain parts of your brain which are the ones your seeing in your dreams. Your only imagining everything that you dream, it's just like daydreaming but instead your asleep and you can really dream it and see what happens.