the inability to obtain adequate sleepthe prolonged bouts of sleeplessness were starting to affect his work
the prolonged bouts of sleeplessness were starting to affect his work
insomnia, wakefulness
alertness, restlessness
drowsiness, sleepinessnarcolepsy
英语同义词词典收录了63618条英语词条，基本涵盖了全部常用同义词或反义词的辨析及翻译，是英语学习的有利工具。