Supposedly good luck..........not in my house or in/on my bed. I kill every spider I see and webs=spiders, so NO thank you. It might be traditional but I'm still not interested. Jmho.
Truly, I don't think I'd want a spider or a spider web on my bed. I'm more "afraid" of spiders than I am of snakes, but I don't want to share my bed with either of these pests.