“On any given day, I would bet that 20 to 25 percent of my students haven’t had more than five hours of sleep,” said David Smith, a history teacher at a high school where the day begins with a “zero…

“I can’t breathe.” That’s the last thing 8-year-old *Alexander told his mother the night he went into anaphylactic shock so severe he had to be airlifted from his local emergency room to a children’s hospital.