sleepy，asleep這兩個形容詞均含有“欲睡的”之意。

區(qū)別在于：

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

2、asleep一般用作表語,意為“睡著的”,強調(diào)狀態(tài)；它不能用very修飾,只可用much,fast,sound等詞修飾。有時也可作后置定語。例如：When he came home last night ,we were allasleep.他昨晚回家時,我們都睡著了。The boy asleep is his son.正在睡覺的那個男孩是他兒子。

3、sleepy：既可作表語,亦可作前置定語。用作前者,意為“困乏的,想睡覺的”,用作后者,意為“貪睡的,好睡的”。例如：I felt sleepy all day.我整天都犯困。擴展資料：Asleep和Sleepy各自的用法：

1、asleep adj. 睡著的,作表語、賓語補足語,指狀態(tài)。The children have been asleep.孩子們已睡著了。He was too tired and fell asleep at once. 他太累了，立刻就睡著了。

2、sleepy adj. 作表語,意為“瞌睡的、困倦的”;作前置定語,意為“寂靜的”She is always sleepy. 她總是想睡覺。I feel very sleepy now. 我現(xiàn)在昏昏欲睡。He goes to bed very late every day,so he often feels sleepy.他每天睡得很遲，因此經(jīng)常感到困乏。