noun / verb
slumber
SLUM-bur/ˈslʌmbər/
Sleep, especially peaceful or light sleep.
She slumbers peacefully beneath the soft blanket.
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.
In context
So saying, he closed his eyes, and resigned himself to slumber as composedly as if nothing out of the common had occurred. The clock on the stables had struck three when he woke again.