go to bed意为“就寝、上床睡觉”，着重指上床准备睡觉的动作。一般说来， go to bed在前，然后才go ／get to sleep或fall asleep。如：
He usually goes to bed at nine o'clock and goes to sleep ／falls asleep five minutes afterwards．他通常九点钟就寝，五分种后入睡。
sleep强调“睡觉”这一动作，是延续性动词，可与表示时间段的状语连用。如：
He slept solidly for ten hours.
他整整睡了十个小时。
She only sleeps for four hours a night.
她每天晚上只睡四个小时。
Did you sleep well last night？昨晚你睡得好吗？
go ／get to sleep指“睡着、入睡”。go to sleep强调“入睡”这个动作，即begin to sleep，指入睡，尤指有意想睡着；而get to sleep强调进入睡眠状态，且多用于否定句、疑问句或条件句中。指开始入睡，尤指经过很长时间或很难才睡着：如：
He was so tired that he went to sleep soon．他很累，不久就睡着了。
I shut my eyes and tried to go to sleep.
我闭上了眼睛想睡。
He woke for a moment and then went to sleep again.
他醒了一会儿，然后又睡了。
I was waiting for the sound of the other shoe！I can't get to sleep．我在等另一只鞋落地声！我睡不着。
He took a long time getting to sleep that night.
他那天晚上过了好长时间才睡着。
fall asleep与go ／get to sleep同义，可互换使用；但fall asleep侧重“无意识地入睡、本不想入睡而入睡”的含义,相当于drop sleep, 有时指无意之中或在不适当的场合睡着：如：
He was so exhausted that he fell asleep at his desk.
他太累了，竟伏在书桌上睡着了。
I pinched myself to stop myself from falling asleep.
我掐自己以防自己睡着。
The moment I closed my eyes, I fell asleep.
我闭上眼睛就睡着了。
I can't get to sleep with all that singing.
那些歌声搅得我无法入睡。
I couldn't get to sleep because I was too excited.
我不能入睡，因为我太激动。
I don't know when I went to sleep ／got to sleep ／fell asleep last night．我不知道昨晚什么时候睡着的。
be asleep表示“睡着”的状态，是系表结构，其中asleep不能用 very修饰，只能用sound，fast等词修饰。be asleep 表示睡的状态；而fall asleep表示睡的动作；
如：
The baby is fast asleep．孩子睡得很香。
What's Ashley doing?’ ‘Sh! She's asleep.’
“阿什利在干什么？”“嘘，她在睡觉。”
The baby was sleeping peacefully.
婴儿睡得很安稳。
The baby was sound asleep upstairs.
婴儿在楼上睡得很香。
She was still half asleep (= not fully awake) when she arrived at work.
她到了上班地点时仍然睡眼惺忪。
My four year-old daughter was asleep on the sofa.
我4岁的女儿在沙发上睡着了。
In moments, I was asleep once more.
不一会儿工夫，我又睡着了。
Sometimes the boy pretended to be asleep
有时这个男孩会假装睡着了。
She buried her head under the covers, pretending to be asleep
她把头埋到被子底下，假装睡着了。
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