Ⅰ. asleep adj “睡着的”;常作表语。如：

　　① The children have been asleep.孩子们已睡着了。

　　② He was too tired and fell asleep at once. 他太累了，立刻就睡着了。

　　Ⅱ. sleep v & n “睡着”。如：

　　① You have a good sleep. 你需要好好睡一觉。

　　② Last night I sleep very well. 我昨天晚上睡得很好。

　　Ⅲ. sleepy adj “困乏的、想睡的”。如：

　　① She is always sleepy. 她总是想睡觉。

　　② I feel very sleepy now. 我现在昏昏欲睡。