insomnia
/ˌɪnˈsɑmniə/
an inability to sleep; chronic sleeplessness
Chinese meaning: 失眠；失眠症
Many students suffer from insomnia due to exam stress.
许多学生因考试压力而失眠。
Chronic insomnia can lead to serious health problems if left untreated.
慢性失眠若不治疗可能导致严重的健康问题。