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 .

他比较了在日本有90分钟午休要求的全日制幼儿园的儿童和其他只在需要时打盹的同龄儿童。