Nocnitsa

She is known to torment children at night, and a stone with a hole in the center is said to be a protection from the Nocnitsa.

The Nocnitsa is also present in Russian, Serbian and Slovakian folklore.

The Nocnitsa, or "Night Hag", in Polish mythology, is a nightmare spirit that also goes by the name Krisky or Plaksy.

The Night Hag is known to sit on your chest and draw your life energy, drawing it until you can not go on (because of this many refer to Nocnitsa as a type of vampire) and she will continue visiting.