Partial sleep (s.partialis) is a disease that affects the cerebral cortex, the temporal lobe cortex and the central areas of the prefrontal lobe cortex. At the same time, memory capacity and concentration of attention decrease, handwriting deteriorates, distractibility, and mental exhaustion appear. Sleep consists of periodic or constant disturbance and interruption of sleep. The causes of the disease can be infectious processes, traumatic brain injuries, neoplasms, systemic and hereditary disorders, etc. Treatment of the disease is carried out by a neurologist or psychiatrist.