All the comments ignore the fact that until the industrial revolution people didn't sleeps a solid 8 hours a night, as in the past people used to practice polyphasic sleep. People used get up in the middle of night a socialise for a few hours before having their second sleep.
Most people have complete control over when they go to bed, as they choose a particular time to go to bed.
Most people have complete control over when they go to bed, as they choose a particular time to go to bed.