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Caption: NOVA: What Are Dreams?: Premiering November 24 at 8pm ET/PT on PBS (check local listings). What are dreams and why do we have them? Are they a window into a hidden realm within us? Science is only just beginning to understand. NOVA joins the leading dream researchers and witnesses the extraordinary experiments they use to investigate the world of sleep. Pictured: Electrodes placed on subject Tristan Shuman for napping experiment at University of Califonia, San Diego.Credit: Bryan DeckerUsage: This image may be used only in the direct promotion of NOVA. No other rights are granted. All rights are reserved. Editorial use only.