Facts about Dreamcatchers
In Native American culture, a dreamcatcher is a handmade object based on a willow hoop, on which is woven a loose net or web. The dreamcatcher is then decorated with personal and sacred items such as feathers and beads.
Traditionally, the Ojibwa construct dreamcatchers by tying sinew strands in a web around a small round or tear-shaped frame of willow. The resulting "dream-catcher", hung above the bed, and was used as a charm to protect sleeping people from nightmares. Only good dreams would be allowed to filter through… Bad dreams would stay in the net, disappearing with the light of day."
Another explanation of Lakota origin, Nightmares pass through the holes and out of the window. The good dreams are trapped in the web, and then slide down the feathers to the sleeping person.