sleep的形容词形式是sleepy；
sleepy：adj.困倦的；瞌睡的；安静的；冷清的
All of a sudden she didn't look sleepy any more.
她突然看起来一点都不困了。
Valence is a sleepy little town just south of Lyon.
瓦朗斯是里昂南面一座寂静的小镇。
I was beginning to feel amazingly sleepy
我开始感到异常困倦。
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