Watch the Oct. 10, 2017 full episode of "Chicago Tonight."

Whether you’re a night owl or an early bird, your sleep is regulated by your circadian rhythm. A sleep expert helps unravel the mystery of our internal clock.

Former IPRA and COPA chief Sharon Fairley officially tosses her hat into the race for attorney general. The latest on who she could face.

A Chicago author tackles the complex life of Muhammad Ali in a new biography with some fascinating revelations.

He helped to define rock ‘n’ roll in the 1960s—and his life was a forged as a child in Nazi Germany. We explore an exhibition about Bill Graham at the Illinois Holocaust Museum.

The Cubs win Game 3 against the Washington Nationals as a scoreless pitcher’s duel gives way to a dramatic finish.

Viewers weigh in on bike safety following our roundup of Chicago cycling news.

Watch the Oct. 9, 2017 full episode of "Chicago Tonight."

In the early 1960s, bald eagles were nearly extinct in the lower 48 states. But government protections and conservation measures have had a huge impact on their numbers. “I think it’s an incredible success story,” said biologist Chris Anchor.

Eli Finkel studies relationships and marriage, and in his new book “The All-or-Nothing Marriage: How the Best Marriages Work,” he argues the best marriages of today are the best the world has ever known.

Cryptic comments, contradictory statements and tweets: President Donald Trump’s foreign policy approach has some members of his own party on edge.

Considered one of the founding fathers of behavioral economics, a field that bridges the gap between economics and psychology, Richard Thaler is known for illustrating how human behavior often contradicts traditional economic logic.

Mayor Rahm Emanuel says the Chicago Police Department’s murder clearance rate is “unacceptable,” as are details out this week describing an “abuse of culture” surrounding police overtime pay. Watch the interview.