Mr. Sandman
What do you call the Sandman in Spanish? ¿Cómo se llama ''Sandman'' en español?
4 Answers
Just another bit of information I came across when I thought of "cucuy" from Mexican culture:
El Cuco, (also coco and cucuy, sometimes also called el bolo) is a monster common to many Spanish-speaking countries.
In Spain, parents will sing lullabies or tell rhymes to children, warning them that if they do not sleep, El Coco will come and get them. The rhyme originated in the 17th century has evolved over the years, but still retains its original meaning. Coconuts (Spanish: coco) received that name because their brownish hairy surface reminded Portuguese explorers of coco, a ghost with a pumpkin head. Latin America also has El Coco, although its folklore is usually quite different, commonly mixed with native beliefs, and, because of cultural contacts, sometimes more related to the bogeyman of the United States. However, the term El Coco is also used in Spanish-speaking Latin American countries, such as Peru, Mexico, Argentina, the Dominican Republic, Chile and Uruguay, although there it is more usually called El Cuco, as in Puerto Rico. In Mexico and among Mexican-Americans, El Cucuy is portrayed as an evil monster that hides under children's bed at night and kidnaps or eats the child that does not obey his/her parents or go to sleep when it is time to do so. However, the Spanish American bogeyman does not resemble the shapeless or hairy monster of Spain: social sciences professor Manuel Medrano says popular legend describes El cucuy as a small humanoid with glowing red eyes that hides in closets or under the bed. 'Some lore has him as a kid who was the victim of violence ... and now he’s alive, but he’s not,' Medrano said, citing Xavier Garza's 2004 book Creepy Creatures and other Cucuys."
In Brazilian folklore, a similar character called Cuca is despicted as a female humanoid alligator. There's a famous lullaby sung by most parents to their children that says that the Cuca will come and get them if they do not sleep, just as in Spain. The Cuca is also a character of Monteiro Lobato's Sítio do Picapau Amarelo, a series of short novels written for children, which contain a large number of characters from Brazilian folklore.
On the children's TV program Sesame Street, the character of Grover was named 'Coco' in the Spanish version.
Read more: http://www.answers.com/topic/bogeyman#ixzz1Od0oM9vd
Good news! Apparently they don't have a Sandman but an "Hombre del Saco" is the Latin's slightly crueler and frightening version. Courtesy of Wikipedia... El hombre del saco, viejo del saco, viejo del costal, el hombre de la bolsa o el viejo de la bolsa es un personaje del folclore infantil hispánico. Se le suele representar como un hombre que vaga por las calles cuando ya ha anochecido en busca de niños extraviados para llevárselos metidos en un gran saco a un lugar desconocido. Este personaje es caracterizado como un asustador de niños, y se utiliza como argumento para asustar a los niños y obligarlos a que regresen a casa a una hora temprana. Es similar al coco y al sacamantecas.
Two come to mind:
hombre de la arena =y=
hipnotizador
Both convey the approximate meaning you are looking for, I believe.... 
