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We spend about 20 percent of our total sleep time in a dream state. For most of us, this means we dream one and a half hours each night or, on the average, spend four years of our lifetime in a dream state.

Patricia Garfield (1995). “Creative Dreaming: Plan And Control Your Dreams To Develop Creativity Overcome Fears Solve Proble”, p.27, Simon and Schuster
We spend about 20 percent of our total sleep time in a dream state. For most of us, this means we dream one and a half hours each night or, on the average, spend four years of our lifetime in a dream state.