Hypervigilant
Sleepless and hypervigilant are semantically related. In some cases you can use "Sleepless" instead an adjective "Hypervigilant".
Sleepless
Sleepless adjective - Not sleeping or able to sleep.
Hypervigilant and sleepless are semantically related. You can use "Hypervigilant" instead an adjective "Sleepless".
Mutual synonyms
Cite this Source
Sleepless and Hypervigilant. (2017). Retrieved 2026, July 31, from https://thesaurus.plus/related/hypervigilant/sleepless
Hypervigilant & Sleepless. N.p., 2017. Web. 31 Jul. 2026. <https://thesaurus.plus/related/hypervigilant/sleepless>.
Sleepless or Hypervigilant. 2017. Accessed July 31, 2026. https://thesaurus.plus/related/hypervigilant/sleepless.
Google Ngram Viewer shows how "hypervigilant" and "sleepless" have occurred on timeline