in my opinion, in general, the history of the polysamnographic system is extremely interesting, kleitmando threw electrodes on the cat’s head and noticed that she had different brain activity in different phases of sleep, and began to be studied on the basis that this is how brain activity was discovered, when we say that slow... wave and fast-wave sleep, yes, that is, it started from - neurophysiologists who studied it was precisely the activity, these very waves, that were already put together, that it was good to see how the muscles were relaxed in order to understand what phase of sleep it was, how the eyeballs moved, in order to understand, again, what phase of sleep a person was in, from this in fact, startanulagia as a science, as a branch of medicine, sleep has been studied very little, yes, more and more new discoveries are appearing, they will appear. due to the fact that our visualization abilities are improving, that is, we have a functional mri, where we can look at the activity of certain areas of the brain, in the best state during sleep, neurobiology is being studied, gene