Trivia: Michael York (Logan 5), Richard Jordan (Francis 7) and Michael Anderson Jr.(Doc), were all over 30 years old when they made the film (the premise of which is that no-one is allowed to live past the age of 30).
Trivia: In the first scene in the Senate Chamber, as Logan and Jessica enter, listen for Peter Ustinov clowning around on the sound track. The cats say "hello" very distinctly, twice. A meow can sound like hello, but not that much like it.
Answer: In popular American lore, the Sandman is responsible for putting sand over your eyes to make you go to sleep. In this context the "sleep" is a euphemism for death, and the enforcers are responsible for making sure that everyone dies on time.
Phoenix