Crossword Genius

Insomnia (13)

Ross

I believe the answer is:

sleeplessness

'insomnia' is the definition.
(I know that insomnia can be written as sleeplessness)

This is all the clue.

(Another definition for sleeplessness that I've seen is " Insomnia".)

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