I don't get it man. They shouldn't work, but... they do! And I have no idea why. I was having a long string of pretty heavy nightmares for a week, put up a cheap dreamcatcher that probably came from the Dollar Store or whatever, and ever since I've probably had like 1 nightmare.
Dreamcatchers are easily the best talisman of all time. Everyone loves them too, even fundamentalists who would otherwise have a problem with icons and stuff. Just a smash hit.