Answer:
I am a tale in childrens' minds. Though an illusion, I occur every night. I give them a fantasy, I give them a fright. What am I?
I sleep by day, I fly by night. I have no feathers to aid my flight. What am I?
I fly away as soon as you set me loose. People around you may slowly move away once they sense my presence.
With a halo of water and a tongue of wood; stone as skin long I stood.
I have a head tail but no arms and legs.
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.