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NOVA: Mysteries of Sleep

Premieres Wednesday, Dec. 8 at 9:30 p.m. Re-airs 12/12 at 1 a.m. and 9:30 a.m.

Like virtually every other animal, humans need sleep to survive. But why? Scientists peer into the brain to see what happens while we snooze and understand the powerful role that sleep—or lack of it—plays in memory, trauma, and emotion regulation.