The brain is asactiveduring REM (rapid eye movement) sleep-when most vivid dreamsoccur-asit is when fully awake, says Dr, Eric Nofzinger at the University of Pittsburgh.

• 匹兹堡大学的埃瑞克·诺夫辛格博士说,在REM(眼睛快速运动)睡眠期间,大脑十分活跃,即便大脑处于清醒状态,千奇百怪的梦也频频出现。