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somnolence (n.)

"sleepiness, drowsiness," late 14c., from Old French sompnolence (14c.), from Latin somnolentia "sleepiness," from somnolentus, from somnus "sleep" (from PIE root *swep- "to sleep"). Related: Somnolency.

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Definitions of somnolence from WordNet

somnolence (n.)
a very sleepy state;
Synonyms: sleepiness / drowsiness
From wordnet.princeton.edu