Volunteers were scanned when they napped in stationary and in rocking beds , revealing enhanced sleep brain activity when rocking .
通过观察志愿者在静止和摇晃的床上午睡时的情况，科学家发现当床摇晃时与睡眠有关的大脑活动会增强。
The old man napped on the porch .
那位老人在走廊上打盹儿。
He napped in the chair .
他坐在椅子上打盹儿。
More importantly their capacities to work and memorize decreased in comparison to those who napped after lunch .
更重要的是，与那些午饭后小睡的人相比他们的工作能力和记忆力都有所下降。
He compared children who attended all-day pre-schools in japan , where 90-minute naps are compulsory , with children of the same age who napped only when they needed to .
