wakeful /ˈweɪkfʊl/

• 1. 

  ADJ Someone who is wakeful finds it difficult to get to sleep and wakes up very often when they should be sleeping. 失眠的

• 2. 

  wakefulness N-UNCOUNT

  例：

  It is never a good idea to take sleeping pills regularly for this kind of wakefulness.

  对付这种失眠，经常吃安眠药绝不是什么好办法。