sleepy，asleep这两个形容词均含有“欲睡的”之意。

区别在于：

1、asleep的意思是“睡着”,而sleepy的意思是“想睡”。例如：The baby fell asleep; and I feel sleepy.孩子睡着了,我也犯困了。

2、asleep一般用作表语,意为“睡着的”,强调状态；它不能用very修饰,只可用much,fast,sound等词修饰。有时也可作后置定语。例如：When he came home last night ,we were allasleep.他昨晚回家时,我们都睡着了。The boy asleep is his son.正在睡觉的那个男孩是他儿子。

3、sleepy：既可作表语,亦可作前置定语。用作前者,意为“困乏的,想睡觉的”,用作后者,意为“贪睡的,好睡的”。例如：I felt sleepy all day.我整天都犯困。扩展资料：Asleep和Sleepy各自的用法：

1、asleep adj. 睡着的,作表语、宾语补足语,指状态。The children have been asleep.孩子们已睡着了。He was too tired and fell asleep at once. 他太累了，立刻就睡着了。

2、sleepy adj. 作表语,意为“瞌睡的、困倦的”;作前置定语,意为“寂静的”She is always sleepy. 她总是想睡觉。I feel very sleepy now. 我现在昏昏欲睡。He goes to bed very late every day,so he often feels sleepy.他每天睡得很迟，因此经常感到困乏。