At least 29 states have considered legislation related to daylight saving time, including making it permanent year-round. But those laws won't take effect until Congress makes it legal.

Nineteen states have passed legislation to make daylight saving time permanent. But those laws won't take effect until Congress makes it legal. And the medical community sees one major problem.

A bipartisan group of senators wants to make daylight saving time permanent. But sleep experts say standard time is better, because it saves morning light and is more in sync with our natural rhythms.

Even guardians of America's atomic clocks say time doesn't work the way we think it does.