Watch the Stages of Sleep tutorial located at the followinglink:http://media.pea

Watch the Stages of Sleep tutorial located at the followinglink:http://media.pearsoncmg.com/pcp/pcp_94178_psych_axia/livepsych/interface/index.htm?atitle=Stages%20of%20Sleep&id1=16_1&id2=16_2&id3=16_3&sid=16_1