Blood (A tale of two sisters)

She woke with a start. She was terrified, something had startled her. The constant thing that always frightened her.

A bad dream. She knew it was a dream, but she couldn't recall it. Perhaps, it may have been because the dream was always long, frightening, and painful. One thing she did remember was, that each time she woke up, she would consistently suffer a splitting headache. Why wasn't it coming tonight? Oh! Wait, here it was, it did come as usual.