1.
insomnia, sleeplessness
The inability to sleep or the condition of being unable to get adequate sleep.
Usage
Used both as a medical term and in everyday conversation. 不眠症 is the clinical term for insomnia as a diagnosed disorder, while 不眠 can refer to any instance of sleeplessness.
Common collocations
Related Words
Antonym:
熟睡 (deep sleep)
Related:
寝つき (ability to fall asleep)
Related:
鬱病 (depression)