In people with short sleep, however, orexin production appears to be increased. Over time, the team has identified seven genes associated with natural short sleep.

They were the first people identified with familial natural short sleep, a condition that runs in families like other genetic traits. Fu and Ptáček traced their abbreviated slumber to a mutation ...

Natural short sleepers are a rare group of people who function well on just 4 to 6 hours of sleep, ... However, most people who get little sleep aren’t naturally wired that way, ...