My immediate thought was it was someone that looks at the clock at 11:30 and goes "alright, it's time to go to bed" and goes to bed, even if they're really enjo

My immediate thought was it was someone that looks at the clock at 11:30 and goes "alright, it's time to go to bed" and goes to bed, even if they're really enjoying that video game or whatever and that they think it's that easy to sleep, afterward.