In zoology, crepuscular refers to animals becoming active at twilight or before sunrise, as do bats and certain insects and birds. On this edition of B-Side we look at what humans do between the hours of 4 and 6 AM. B-Side’s Tamara Keith and Rene Gutel visit a 24-hour big box super center to see who works and shops before dawn.

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“Who Needs Coffee When you Have Rowing?” Rob Sachs:
Each day millions of people sputter around Southern California ebbing and flowing through interchanges on massive highways that stretch 5 lanes wide on each side creating quite a din. But at 4AM the streets of Marina Del Rey are quiet. Two female athletes have convened at a place called Mother?s Beach in pursuit of a little bit of early morning workout. B-Side’s Rob Sachs met up with them.

“Music Just Before Dawn” Molly Peterson:
Some of the best times at a concert happen before — and after — the music itself. Molly Peterson and her friends have been going to the New Orleans Jazz and Heritage Festival every year for 10 years. They go to the late-night concerts that run into early morning. And over time, the way that they go hear music there has changed. Here’s their story.