Familial Advanced Sleep Phase Syndrome is a genetic condition causing an early bedtime due to mutations in clock genes.

“what is called technically familial Urban sleep Fest syndrome so these people um you can give them caffeine or whatever but they will fall asleep say at eight o'clock they cannot stay awake till nine or ten and since it's a very strong phenotype in sleep and circadian rhythm field they are very well studied so in fact Louis potashek and ingwifu they were the first one to track one family like this and then they figured out there was a mutation in one of the clock genes period two that clocked in and that mutation um allowed the clock to run in a way that these people went to bed very early”