DictionaryRoot: slumen
Middle English
slumen
to doze
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noun / verb
slumber
SLUM-bur/ˈslʌmbər/
Sleep, especially peaceful or light sleep.
Etymology
The verb combined “doze” with an ending suggesting repeated or slight action, evoking intermittent light sleep. The noun broadened to sleep or repose, allowing its present use for peaceful or deep sleep.