early 15c., from sleep (n.) + -less. Old English had slæpleas but the modern word seems to be a re-formation. Similar formation in German schlaflos, Dutch slapeloos. Related: Sleeplessly; sleeplessness.
双语例句
1. A sleepless baby can seem to bring little reward.
宝宝睡不着觉似乎没有任何好处。
来自柯林斯例句
2. I have sleepless nights worrying about her.
我好几个晚上都睡不着，一直担心她。
来自柯林斯例句
3. I've had a few sleepless nights recently.
最近我有好几个晚上没睡觉。
来自《权威词典》
4. His identification with the hero of the book made him sleepless.
对书中主人公的同情使他睡不着.
来自《简明英汉词典》
5. The boy's misconduct cost his mother many sleepless nights.
