Slow and fast sleep

In the early 50-ies of our century there was a small but very significant revolution in the doctrine of the sleep. It turned out that each of us every night, sometimes two sleep state. These States are completely different, and we several times throughout the night move from one state to another. Called them slow and fast sleep because of the picture accompanying these dream of electric oscillations.
We already know that immersion of a person in deep sleep there are clear slow oscillations waves electroencephalogram. Knew about it from the end of 20-ies of our century, and even learned to use in practice. Long-produced, for example, apparatus for determining the depth of anaesthesia. On the operating table, giving anesthesia, register currents of the brain; the appearance of slow regular waves with a frequency of 2-4 Hz per second means that occurred drug status and you can put the knife of the surgeon. Americans used this phenomenon in the other order: the pilot behind a steering wheel of the plane, continuously discharge currents of the brain on a special device; once there slow signals indicating that the pilot shameless fell asleep at his workplace, triggered feedback, device causes the patient shock, and the pilot, waking up, starts interrupted duties. All this was known. But nobody thought to watch sleeping throughout the night. If such interest was manifested in a timely manner, about the fast sleep would be known a quarter of a century earlier. However, at that time, this "all-night" observation would be to implement the more technically difficult.
Anyway, the night observations have been made and gave unexpected results. After immersion of a person in a dream the first 30-60 minutes in the EEG marked the usual slow waves, all as it should. Suddenly, the picture changes dramatically: you experience fast, disordered fluctuations, as when awake. Meanwhile a person is asleep, and very deep. Scientists began to study carefully this new neurophysiology condition and saw that it differs sharply from the slow sleep not only the pattern of currents in the brain. For example, the eyeballs at slow sleep lifted up and fixed; we say that a man in a dream rolls his eyes. As soon as the quick sleep, eyes start to run under the closed eyelids, as if the person something monitors. He breathes not so smoothly and, most importantly, if its Wake, will tell you that he was dreaming. Wake him up in a slow sleep - it is in most cases will say that nothing was dreaming; if dreams were, they are far less bright, it's not "vision"and a vague thoughts or faded memories. Thus, dreaming visit us mainly in fast sleep. However soon forgotten. If you Wake up the sleeping through half a minute or a minute at the end of the next period of REM sleep, people will talk about what has treated its nightlife. If you Wake up in three or five minutes, we usually say that nothing was dreaming. Sleepy consciousness quickly cover up their traces.
There are people who claim that they have never dreams. These people honestly mistaken. They have every night necessarily a quick NAP, and hence dreams. However, they quickly dream is especially strong. Wake up they, as a rule, not immediately after school, and after some time, sufficient to ensure that the traces are seen were swept. If to watch for such person's period of REM sleep (on waves electroencephalogram or just started on the movements of the eyeballs) and to Wake up, he will say: "finally I had a dream - the first time in my life. Yes some interesting color!" One third of people through his personal data, colourful dreams, the rest have to be content with black-and-white variant.
To the question about the dreams, we'll come back, and very thoroughly, and now continue to talk about the fast sleep. For the body it's absolutely necessary. Was put such experiments: the man woke each time you fast asleep, i.e. not given throughout the night to develop this form of trance. In the morning he did not feel well rested, broken. If awakened many times, but without the "sight" against REM sleep, it did not violate health and performance. Both types of sleep is absolutely necessary, and some modern scholars explicitly say that the human brain can be in three main conditions: in wakefulness, slow dream, fast asleep. What are the duties of a sleep state in General and its two forms in particular?
Sleeping bear in our body the two functions, duties and power, restoration of resources of nerve cells and information, ordering, sorting, as if the keyboard layout on the shelves of those experiences, traces of which have accumulated during the day.
I. P. Pavlov emphasized the importance of sleep to recover resources nerve cells. Modern neuroscientists focused on the information side; the brain must free up RAM memory to load during the next period of wakefulness and communication with the outside world. Since energy and information - two areas that play a major role in our world, can hardly be opposed to each other two functions of sleep. They need both, and you can put that slow sleep solves main problems of energy, and quick information.