During REM (Rapid Eye Movements) sleep, our brains and minds are in the dream world.

The REM dream is the moment when people see a dream. There is one big difference between a dream and normal imagination. 

In the daytime, we can make difference between imagination and reality. But somehow dreams are always real to us. And that's why we can call that thing a "dream world". The question in the dreams is why we cannot separate them from reality. Nightmares can wake us and that makes us tired in the morning. So why we cannot make that difference with dreams and reality when we sleep?

Dreams are causing similar psychosomatic feedback as reality. The nightmares cause strong feedback. And in some cases sleep paralysis caused even death for people during nightmares. 

REM is very important for people so that they feel fresh in the morning. Without REM periods people feel tired. The thing is that during sleep our memory is cut off. And we are hard to remember our dreams. Sometimes researchers are introduced that dreams are things that are releasing all our brain resources for productive work. And whose purpose is to analyze what happened in the daytime. 

But why we cannot remember what happens during sleep? The REM periods are timed just after the beginning of sleep. And then another REM period happens just before the person wakes up. So the purpose of REM might be to test connections in the human brain. But some people believe that REM's purpose is to wipe out things that happen in the human brain during the delta or deep sleep period. 

The delta- or deep-sleep period is the longest period during sleep. And that thing is one of the last frontiers in the brain. There is a theory that during that period the brain is searching for things from the DNA memory and, of course, loads neurotransmitters for the next day. 

We know that all periods of sleep are important. The REM period is only a short moment of sleep. So many secrets are waiting for solving in the human brain. 

Dream research is an interesting thing. The nightmares are connected with things like Alzheimer's and Parkinson's. Bad dreams are telling that something is not right in the human body. But the problem is how to confirm what kind of dreams people are seeing. The test person might not remember things that they see because memory is switched off while people are sleeping. 

That thing makes dreams interesting. Why we must not remember things that we see in the dream world? REM dream is an interesting thing. But also delta dream plays a big role in dreams. Maybe the neuro-implants and ability to decode the EEG make someday possible to see things that people see when they are dreaming. But before that dream research bases the will to tell what people are seeing during sleep. 

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Traffic noise can decrease cognitive abilities.

Sleeping problems are opening the road for finding out why people see dreams. So many researchers highlight the REM periods of sleep. But also the other periods of sleep have a purpose. Deep sleep periods are the most mysterious things in sleep. 

Most of the sleep is deep sleep or delta-sleep. And things that happened during those periods are a mystery. And there is the possibility that a person sees dreams during those periods. But the REM period just before awakening wipes those things out of the memory. 

But the fact is that REM (Rapid Eye Movements)  sleep is only a short period of sleep. And also, deep sleep periods are important things for the quality of sleep. The thing is that deep sleep period are important so that brains can rest. 

During those periods brains are loading their neurotransmitters. So maybe the other purpose of the REM period is to test the neural tracks for the next day. And maybe another reason for the REM period is that it's the indicator that brains realize the level of sleep. 

Some researchers believe that the purpose of the REM period is to wipe out things that a person saw during deep sleep periods. But there might be many purposes for REM sleep. And one of them might be to prepare the person for the next day. 

Even low-level traffic noise can decrease cognitive abilities. The fact is that the traffic noise will keep the person awake.  And it can decrease the level of sleep. And that causes the quality of sleep decreases. The increasing level of the REM periods is causing a situation where some neurotransmitters get lower and that causes that in the morning person will be tired. Good and effective sleep also requires so-called deep sleep periods because brains are loading their neurotransmitters during deep-sleep periods. 

The brains will load neurotransmitters during those periods. And the purpose of REM sleep could be to test the neural tracks. Maybe one of the purposes of REM sleep is to prepare people for the next day. There are also some psychological purposes for that thing that we call sleep. In some models during sleep person will analyze the things that are too hard to handle when a person is awake. 

But the REM sleep along with its dreams is a so-called light dream. The purpose of a light dream is when something is felt threatening.  If a person is in the REM period, the person can wake up very fast. So maybe the purpose of REM sleep is to act as a mark that the level of sleep is at a certain level, where fast waking and acts just after that is possible. 

The traffic noise would make brains feel that person is under some kind of threat. And that keeps the sleeper almost awake. The traffic noise can mean that the car is driving over that sleeper. Especially when traffic noise suddenly starts after midnight brains have problems getting back to sleep. 

When a person sleeps, the brain cannot make difference between real- and hypothetical threats. There are no virtual threats in nature. So traffic noise is more harmful to sleep quality than it should. And even low noise traffic can cause the quality of sleep decreases. That thing causes problems with cognitive actions. 

When a person is tired that thing affects the ability to concentrate and think. The traffic noise is the mark of hypothetical threats as I wrote earlier. And the problem with human brains is that they are created to make a person survive in dark forests where all threats are real. That's why human brains are taking all things seriously. 

https://scitechdaily.com/bad-things-happen-after-dark-scientists-call-for-new-research-on-how-our-brains-change-when-were-awake-after-midnight/

https://scitechdaily.com/traffic-noise-can-slow-cognitive-development/

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