I Just Wanna Sleep

From the day he was out of diapers, he never knew a peaceful life. Alone as a child and sent to a orphanage with questionable practices, then adopted by criminals and grew up to work in a black company. There was not a time where he could rest in peace except for when death finally came. But now, in this new world and in his new body, he will do whatever it takes to protect his sleep time. Whether it's defeating the demon king or making friends with the hero, as long as it protects his peaceful sleep he'll do it.