ETYMOLOGY
from Latin semisomnis, semisomnus, (from semi- + somnus (sleep) + -ous
EXAMPLE
“… ‘‘ Time sadly overcometh all things,” says Sir Thomas Brown, ‘‘and is now dominant, and sitteth upon a sphinx, and looketh unto Memphis and old Thebes; while his sister Oblivion reclineth semisomnous on a pyramid, gloriously triumphing, making puzzles of Titanian inscriptions, and turning old glories into dreams. History sinketh beneath her cloud. …”
From: The Superhuman Origin of the Bible: inferred from itself
By Henry Rogers, 1873
Lexicophilia 