When you want to read in both German and English, though, there's a great option: bilingual books! Reading bilingual books and inferring the vocabulary and grammar is a far superior method of language learning than traditional memorization. It is also much less painful. The Sandman is a mythical character in Western and Northern European folklore who puts people to sleep and brings good dreams by sprinkling magical sand onto the eyes of people while they sleep at night, i.e. rheum. The Sandman is a traditional character in many children's stories and books. In Scandinavian folklore, he is said to sprinkle sand or dust on or into the eyes of the child at night to bring on sleep and dreams. The grit or "sleep" (rheum) in one's eyes upon waking is the supposed result of the Sandman's work the previous night. E. T. A. Hoffmann (1776-1822) a story in 1816 called Der Sandmann, which showed how sinister such a character could be made. According to the protagonist's nurse, he threw sand in the eyes of children who wouldn't sleep, with the result of those eyes falling out and being collected by the Sandman, who then takes the eyes to his nest on the Moon and uses them to feed his children. The protagonist of the story grows to associate this nightmarish creature with the genuinely sinister figure of his father's associate, Coppelius. In Romanian folklore there is a similar character, Mos Ene (Ene the Elder). Heinrich Hoffmann (June 13, 1809 - September 20, 1894) was a German psychiatrist, who also wrote some short works including Der Struwwelpeter, an illustrated book portraying children misbehaving.