Lights out
Slumbertime and lights out are semantically related In some cases you can use "Slumbertime" instead a noun phrase "Lights out".
Slumbertime
Lights out and slumbertime are semantically related in time for bed topic. You can use "Lights out" instead a noun "Slumbertime".
Cite this Source
Slumbertime and Lights out. (2016). Retrieved 2026, August 10, from https://thesaurus.plus/related/lights_out/slumbertime
Lights out & Slumbertime. N.p., 2016. Web. 10 Aug. 2026. <https://thesaurus.plus/related/lights_out/slumbertime>.
Slumbertime or Lights out. 2016. Accessed August 10, 2026. https://thesaurus.plus/related/lights_out/slumbertime.
Google Ngram Viewer shows how "lights out" and "slumbertime" have occurred on timeline