Dreaming of Beheadings

I blame it on the Valerian Root I began taking to help me sleep better. Last night, I dreamt that I was riding a bike, holding on my handlebars a giant sheet of mirrored glass. As I began rolling down a hill, I passed a girl walking with a blue shirt and pink dress. Unfortunately, she didn't get out of the way so the glass cut off her head. I kept riding hoping I wasn't seen.