每日雅思词汇：sleep　　睡眠sleep/slumber; 　　嗜睡的lethargic; 　　昏昏欲睡的somnolent/drowsy; 　　打瞌睡doze off; 　　打哈欠yawn; 　　伸懒腰打哈欠stretch oneself with a yawn; 　　失眠insomnia; 　　睡过了oversleep; 　　熟睡sleep soundly/fast asleep/sleep like a log; 　　小睡take a nap/catch some Z 　　梦游sleepwalk