Inguma

Inguma (or Mauma, as called in Baigorri) is the god of dreams in Basque mythology and religion. He was regarded as a malevolent force who entered houses at night and plagued the residents with nightmares. He also kills people while sleeping.

In popular culture
Inguma is mentioned in "Ofrenda A La Tormenta" ("Offering To The Storm") the third part of the Baztán Trilogy by Dolores Redondo.