- Definitions|1
- Thesaurus|214
- Abbreviations|0
| wakefulness(noun, activity, restlessness, insomnia) | |
| insomnia(noun, activity, restlessness, inability) | |
| restlessness(noun, activity, insomnia) | |
| agitation | |
| vigilance(noun, activity, insomnia) | |
| insomniac | |
| tossing and turning(expression, idiom, restlessness) | |
| vigil(noun, insomnia) | |
| insomnolence(noun, insomnia) | |
| restiveness(noun, restlessness) | |
| tension(noun, worry, strain, anxiety, stress) | |
| turmoil | |
| acuity | |
| acuteness | |
| agility | |
| alertness | |
| all-night vigil | |
| attention | |
| attentiveness | |
| brightness |
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| APA | Smart Define. (2015). sleeplessness thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/sleeplessness/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "sleeplessness thesaurus" https://smartdefine.org/sleeplessness/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, sleeplessness thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/sleeplessness/thesaurus/synonyms>. |
| MLA | Smart Define. "sleeplessness thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/sleeplessness/thesaurus/synonyms> |