On rare occasion, usually only if gravely injured, Demons will sleep properly, meaning they won't wake up if danger is near. During this deep sleep their breathing stops, and their heartbeat is impossible to detect manually. This only really occurs if the Demon feels it safe to do so, though.
YOU ARE READING
Black butler Headcanons
FanfictionJust some book filled with whatever Black Butler based nonsense my brain decides to cough up.
