Bogeymen, or Bogey Men, are a species of dream demons.
As a boy once found out, the Bogeymen are rubber-like goblin-phantasms capable of appearing within the dream realm of Lullaby Land, much like the more benevolent Sandman. They are constantly-shifting spookies who chase the dreamer about and dance infernal dances, all with the goal of scaring them; they vanish like smoke as the Sandman comes near. What relationship might exist between these insubstantial Bogeymen (plural) and Oogie Boogie, the Bogeyman, formerly the ruler of the holiday of Bug Day and now one of the horrors of Halloween Town, is exceedingly unclear.
Behind the scenes
The Bogeymen appear in the 1933 Silly Symphonies cartoon Lullaby Land.