is thought to have a short-sleep gene and about 3% have a long-sleep gene.
there are however some people who genetically require more or less sleep. about 3% of the population is thought to have a short-sleep gene and about 3% have a long-sleep gene. those who carry the short-sleep gene sleep on average about two hours less a night — but still function perfectly well. on the other hand those who carry the long-sleep gene need more sleep and it is not unusual for them to require up to two hours more sleep than most other people.
as the short and long sleep gene are a genetic characteristic the need for 