Myoclonic epilepsies represent 6% to 25% of all epilepsies, which are frequently misdiagnosed, underdiagnosed and misunderstood as a mechanism. The aim of the research was seizures. Materials and methods. We performed clinical and neurophysiological examination (night video EEG-EMG monitoring - 10 hours) in 51 patients with myoclonic seizures (mean age 25 ± 9 years, 15 men). Results and discussion. In 36 patients we recorded 49 myoclonic seizures. Clinically, the combination of myoclonic seizures with generalized tonic-clonic seizures prevailed - 53%. The correlation of the myoclonus with the specific generalized hot flash was highlighted in the average third of the hot flash (44%). The onset of myoclonus on the slow-wave polyspike pattern prevailed (41%) at the onset of the ascending portion of the slow wave. Conclusions. Polygraphy with simultaneous EMG-EEG recordings is a crucial tool for highlighting the peculiarities of epileptic myoclonic seizures. The evaluation of the clinical-electroencephalographic correlations demonstrates the presence of a vast polymorphism not only clinically but also electrophysiologically, suggesting the persistence of different mechanisms underlying the generation of the myoclonus