To pass (time) in sleep: slumbered the night away. (verb-transitive)
A state of inactivity or dormancy.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "slumber" in a sentence
"Waking up at 2: 30 without the power to fall back into slumber is disconcerting."
"Now his mother, for long absence, had forsworn sleep and given herself to mourning and weeping and wailing, till she fell sick and ate no meat, neither took delight in slumber but shed tears night and day."
"Abdullah was a-wearied with watching and wanted to sleep, they also lay beside him on another couch and waited till he wasdrowned in slumber and when they were certified thereof they arose and knelt upon him: whereupon he awoke and seeing them kneeling on his breast, said to them, “What is this, O my brothers?”"