Rapid Eye Movement Photo Credit Source Source E.Chudler Rapid Eye Movement 122 days sleeping Washington State: Neuroscience for Kids: What is Sleep Sleep stages Neuroscience for Kids Sleep Eric Chudler's Neuroscience For Kids web site Sleep Source falling off a cliff. Sleep stages Neuroscience for Kids Sleep Neuroscience for kids: Sleep http://faculty.washington.edu/chudler/sleep.html falling off a cliff. Sleep stages Sleep stages falling off a cliff.