C1 noun /ɪnˈsɒm.ni.ə/
Insomnia
бессонница
Meaning
habitual sleeplessness; inability to sleep; the condition of being unable to sleep
Example
Her chronic insomnia made it difficult for her to concentrate during work hours.
Её хроническая бессонница затрудняла ей сосредоточение во время рабочих часов.