Word Origin & History
slumbermid-14c., alteration of slumeren (early 13c.), frequentative form of slumen "to doze," probably from O.E. sluma "light sleep" (cf. M.Du. slumen, Du. sluimeren, Ger. schlummern "to slumber"). Frequentative on the notion of "intermittent light sleep." The noun is attested from late 14c. Slumber party first
recorded 1942.