Why do people associate the mythological figure, Sandman, with sleep or sleeping?
user
The mythical figure of the Sandman is usually portrayed as a magical figure who brings good dreams to children.  Specifically, the origins of Sandman myth are thought to be from folklore, with the first written mentions dating back to the Middle Ages.  The name Sandman has been used to refer to the act of falling asleep and the dreams associated with sleep for thousands of years, and this usage is thought to be derived from the mythological figure.
assistant
Why do people associate the mythological figure, Sandman, with sleep or sleeping?
user
Sandman is a popular literary and cultural figure dating back to the works of German philosopher and poet, Johann Wolfgang von Goethe, who first described the character and his role as middleman between the land of the living and dreams. In later iterations of the character, Sandman is a supernatural being with the power to put people to sleep, or in a state of dreams and hallucinations. It is this latter aspect which is perhaps the most familiar representation of the Sandman, and which has been most strongly associated with the character and his role in human culture and mythology.
assistant
Why do people associate the mythological figure, Sandman, with sleep or sleeping?