What does “hang your head over” mean in “Down in the Valley”?

Picture​I’m sure I sang “Down in the Valley” in grade school, and I know I’ve had a picture in my mind of someone on the edge of a cliff overlooking a valley, lying face down and literally hanging her head over the edge, with her hair falling over her face and blowing in the breeze. (I guess I always thought it was “her” since I pictured long hair.) The image seemed pretty strange to me. Why would anyone do that?

So when my choir sang an arrangement of this song I decided it was time to step up and find out just what was a-goin’ on. It’s been a fascinating journey.

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