Familial link for Parkinson's disease discovered

Abnormal sleeping behavior may offer scientists more clues for a better understanding of the condition. Nora Zheng reports from Hong Kong.

Lok Sau-yung dreamed she was on a road walking toward a large pit. She feared that she might fall through the loose boards covering the top, but a worker reassured her that it was OK, so she carried on, and fell straight into the pit.

In reality, she had fallen out of bed, injuring her mouth so badly that seven stitches were required.