Adjective:

1. experiencing or accompanied by sleeplessness;

   "insomniac old people"
   "insomniac nights"
   "lay sleepless all night"
   "twenty watchful, weary, tedious nights"
   

2. always watchful;

   "to an eye like mine, a lidless watcher of the public weal"
   

cautiousadj.谨慎的；十分小心的

wakefuladj.(人)醒着的；(夜间)不眠的；睡不着的

restlessadj.不安宁的；焦虑的；得不到休息的

disturbedadj.有心理疾病的；不安的动词disturb的过去式和过去分词.

unsleepingadj.未入睡的；警觉的；时刻戒备的

awakeadj.醒着的；警觉的v.唤起；唤醒；醒来

alertadj.警觉的；灵敏的vt.使意识到；警惕n.警戒；警报

activeadj.活跃的；积极的；起作用的；灵活的

vigilantadj.警戒的；警惕的

attentiveadj.注意的；留意的

readyadj.准备好的；现成的；乐意的；情愿的

livelyadj.活泼的； 活跃的； 栩栩如生的； 真实的adv.<废语>生机勃勃地

insomniacn.失眠患者adj.失眠的；引起失眠的

watchfuladj.注意的；警惕的；<古>不眠的；醒的

lidlessadj.无盖的；无眼脸的；看得见的

1. She was worn-out after three sleepless nights.
   三夜未眠之后，她已筋疲力尽了。
2. She looked pale and drawn after weeks of sleepless nights.
   她经历了数周不眠之夜，看上去脸色苍白，形容憔悴。
3. He was lying on the sleepless bed.
   他躺在床上睡不着。
4. The situation gave her many sleepless nights.
   这种情况害她一连好多天睡不好觉。
5. Her irresponsible behaviour cost her father many sleepless nights.
   她那不负责任的行为使她父亲许多夜不得安眠。
6. Because of the cold weather, they are now preparing for a sleepless night.
   由于寒冷的天气
7. The snake frightened the skinny boy. He had a sleepless night.
   那个瘦小的男孩被蛇吓坏了,整晚上都很警觉。