For children to obey before bed, parents scare them.
In Ukraine, Russia and Belarus, children are frightened by Baba Yaga, Barmaley, Wolf, Drum, Belt, Uncle Policeman and Babai. By the way, Babai is translated from Tatar as Grandfather, and Babayka is Grandmother, but this is not explained to children and their childhood fears and fantasies add to the picture of terrible monsters. So who else scares children?