Sasaki knew the first-night effect probably has something to do with how humans evolved.

佐佐木知道，初夜效应可能与人类的进化有关。

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That people often experience trouble sleeping in a different bed in unfamiliar surroundings is a phenomenon known as the "first-night" effect.

在不熟悉的环境中，人们经常在陌生的床上睡不着觉，这种现象被称为“初夜”效应。

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The researchers believe this is the first time that the "first-night-effect" of different brain states has been identified in humans.

研究人员认为，这是首次在人类身上发现不同大脑状态的“首夜效应”。

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Governments have tried advertising campaigns to coax their citizens into unplugging cellphone chargers and turning off their TV sets at night, to little effect.

WSJ: Switching Off Standby Mode

Recent studies conducted by scientists in Israel showed that even losing an hour of sleep a night can have a noticeable effect on a child's mental performance.

BBC: Children losing out on sleep

But he said it was possible that the oxygen surges which follow the repeated oxygen supply restrictions in the night could have a damaging effect on the liver.

BBC: NEWS | Health | Sleep disorder liver disease link