"The thinking was that the dreams were meaningless and didn't serve any function at all," says Harvard psychology professor Deirdre Barrett, PhD.

“他们认为梦毫无意义，不起任何作用。”哈佛心理学教授戴隹巴瑞博士说。

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CNNMoney's Jennifer Liberto and CNN's Ted Barrett, Deirdre Walsh and Paul Steinhauser contributed to this report.

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CNNMoney's Jeanne Sahadi and CNN's Ted Barrett, Deirdre Walsh and Ashley Killough contributed to this report.

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CNN's Dana Bash, Deirdre Walsh, Ted Barrett and Terry Frieden contributed to this report.

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