1、sleep 的意思是“睡覺,睡眠”，可以作為名詞用，跟在形容詞後面；

而sleeping 是 sleep 的現在分詞或動名詞，是形容詞，可作前置定語，另外它還是個動名詞。

例： You have a good sleep.

你需要好好睡一覺。

the sleeping car

臥車車廂

2、sleepy是sleep 的形容詞形態,作表語,意為“瞌睡的、睏倦的”;作前置定語,意為“寂靜的”；

而asleep是表語形容詞,只能做“表語”,意思是“睡著的“，作賓語補足語,指狀態。

例： Last night I sleep very well.

我昨天晚上睡得很好。

The children have been asleep.

孩子們已睡著了。

He goes to bed very late every day,so he often feels sleepy.

他每天睡得很遲，因此經常感到睏乏。

She is always sleepy.

她總是想睡覺

3、fall asleep 是動詞片語， 意思是”入睡“，表示剛剛睡覺時的狀態。

He was too tired and fell asleep at once.

他太累了，立刻就睡著了。

He has fallen asleep.

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擴充套件資料

1、I didn"t sleep well last night. So I"m feeling sleepy.

2、Don"t make any noise. There is a sleeping baby here.

3、He was fast asleep. I couldn"t wake him up.

4、Humans and animals generally have innate sleep - wake cycles close to but not exactly 24 hours.