スリープレス・ビューティー

"I wish I could share my sleepiness with you, Oz-san." Oz, a designer who has insomnia, secretly admires Amamiya, a kouhai in the general affairs department. Oz admires the way he can quickly turn down a drinking session he doesn't feel like attending, and the way he takes a nap for exactly 15 minutes during his lunch break. Oz, who has a tendency to overthink things and is unable to get along easily with others, looks at him with envy. On his way home one day, Amamiya invites him out for a drink, and fueled with alcohol, Oz grumbles about his insomnia problems. Afterwards, he decides to let a drunk Amamiya stay at his house. There, Amamiya proposes "co-sleeping" as a solution to Oz's insomnia, and...!? (Source: Kaiohsha, translated) Note: Includes 1 extra chapter.