We've been hearing conflicting messages in the media lately. People who sleep longer have better memory, yet people who sleep less live longer, etc. How much sleep do our brains and bodies need? Larry Mantle talks with experts, UCLA Professor of Psychiatry Dr. Jerome Siegel and Harvard Medical School Assistant Professor of Psychiatry Dr. Robert Stickgold, about the science of sleep. They also discuss the latest research on dreaming, sleep apnea, and insomnia.