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"sleeplessness" is also used as a crossword clue. If that's what you saw, the answer is often insomnia (8 letters).
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Definitions
a temporary state in which you are unable (or unwilling) to sleep
Word origin
From sleepless + -ness.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer0 curated clues
No curated clues for sleeplessness yet.