1 disturbed, insomniac, restless, unsleeping, wakeful
2 alert, unsleeping, vigilant, watchful, wide awake
English Collins Dictionary - English synonyms & Thesaurus
1 adj A sleepless night is one during which you do not sleep.
usu ADJ n
I have sleepless nights worrying about her.
2 adj Someone who is sleepless is unable to sleep.
A sleepless baby can seem to bring little reward.
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