Nerve cells regenerate during sleep, neurons that have outlived their useful life dissolve and new ones grow in their place, a neurologist Pavel Khoroshev told URA.RU. During sleep, not only information processing takes place. The most important work that happens during sleep: the cleaning of the brain. Some neurons that have outlived their useful life dissolve and new neurons grow in their place. There is a misconception that nerve cells don't regenerate, they do. The cells that should have died, old, diseased cells, they dissolve. And, accordingly, new ones grow in their place. And they don't just grow, they have to take over the functions of the old cells to the maximum and fill the space, said Pavel Khoroshev. According to the neurologist, all this happens during sleep. And not in one cycle of sleep, but in several cycles, so it is desirable for a person to have healthy sleep. Healthy sleep is very important. If a person's sleep is short, this process will not have time to complete, not that it will be put on pause, it will just go much slower during wakefulness, Khoroshev said.