mid-14c., from slumber (v.). Slumber party first recorded 1942. Slumberland is from 1875.
slumber (v.)
mid-14c. alteration of slumeren (mid-13c.), frequentative form of slumen "to doze," probably from Old English sluma "light sleep" (compare Middle Dutch slumen, Dutch sluimeren, German schlummern "to slumber"). Frequentative on the notion of "intermittent light sleep." For the -b-, compare number, lumber, chamber, etc. Related: Slumbered; slumbering.
例文
1. She fell into a deep and peaceful slumber .
彼女は眠っていて、ぐっすり眠っています。
2.All the people in the hotels were wrapped in deep slumber .
各ホテルに住んでいる人はみな夢の中に入っている。
3.Coercer: Slumber -Mesmerize effect can now affect Epic targets.