The Native American Indians believed that dreamcatchers caught negative dreams in their weblike structure and held them until daylight when the sunlight hit them at dawn. The negative energy caught in the web was destroyed.
A few interesting facts about Dreamcatchers:
They're supposed to catch the bad dreams, not the good ones!
Based on Native American Legend, first noted in 1929
The web shape of dreamcatchers reflects a spider's web which catches the bad dreams, while the central hole allows good dreams to pass through
The dreamcatcher's feathers attached to the bottom act as soft slides for good dreams to slide to you
They originally were made to collapse after some time to teach that nothing lasts forever