ETYMOLOGY
from Latin dormire (to sleep) + -ous
EXAMPLE
“…and the busie Bell-man bounced twice at the door, and as well the Champion as Soto began to grow dormious, which occasioned the Host to petition their present departure to bed, which (with heavie heads heaven knows) they went to…”
From: Don Zara del Fogo: a Mock-Romance
By Samuel Holland, 1656
Lexicophilia 