doze off (v.+adv.)
打盹儿，走神儿fall into a  light sleep unintensionally
▲doze off
I dozed off in the middle of the meeting.开会期间我打了个盹儿。

用作不及物动词
▲S+～(+A)
The old man dozed in his armchair.那个老人坐在扶手椅中打盹儿。