Here's a picture:"In Ojibwa (Chippewa) 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."
"The Ojibwa believe that a dreamcatcher filters a person's dreams. According to Terri J. Andrews in the article "Legend of the Dream Catcher," about the Ojibwa nation in the magazine World & I, Nov. 1998 page 204, "Only good dreams would be allowed to filter through . . . Bad dreams would stay in the net, disappearing with the light of day."
It's recommended to hang the dream catcher above someone sleeping to guard against bad dreams. Good dreams pass through and slide down the feathers to the sleeper."

So I have three questions:
1) Do you use a dreamcatcher?
2) if you do use a dreamcatcher, how often do you have Nightmares?
3) if you don't use a dreamcatcher, how often do you have nightmares?