Crossword Genius

Inability to sleep (8)

Ross

I believe the answer is:

insomnia

'inability to sleep' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for insomnia that I've seen before include "Condition affecting sleep" , "In restless state" , "Sleep disorder" , "Inability to drop off" , "Habitual inability to sleep (8)" .)

I've seen this clue in The Telegraph, The Times, the King Feature Syndicate and the Sydney Morning Herald.
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