to bed的意思是“上床”、“就寢”,bed之前不能加定冠詞the,也不能加this、that、your、my等詞,因?yàn)樗枪潭ㄔ~組.例：
When did you go to bed last night?
昨晚你幾點(diǎn)鐘上床?
I usually go to bed at eleven．
我通常十一點(diǎn)就寢.
go to sleep的意思是“入睡”、“睡著”.因此,go to bed并不等于go to sleep. 如所周知,一個(gè)失眠的人往往在go to bed之后過(guò)了很久也不能 go to sleep. 例：
Last night I was too excited to go to sleep．
昨晚我激動(dòng)得不能入睡.
I went to sleep at two this morning!
今晨?jī)牲c(diǎn)我才睡著.
現(xiàn)將 go to bed和go to sleep用在一個(gè)句中,以便區(qū)別：
She usually goes to bed at nine and goes to sleep a few minutes afterwards．
她通常九點(diǎn)上床,幾分鐘后就入睡.