section_path: Timing/Genetics/Genes for short sleep duration
section_name: Genes for short sleep duration
paragraph_text: Genes for short sleep duration
  
  Familial natural short sleep is a rare, genetic, typically inherited trait where an individual sleeps for fewer hours than average without suffering from daytime sleepiness or other consequences of sleep deprivation. This process is entirely natural in this kind of individual, and it is caused by certain genetic mutations. A person with this trait is known as a "natural short sleeper".
  
  This condition is not to be confused with intentional sleep deprivation, which leaves symptoms such as irritability or temporarily impaired cognitive abilities in people who are predisposed to sleep a normal amount of time but not in people with FNSS.
  
  The genes DEC2, ADRB1, NPSR1 and GRM1 are implicated in enabling short sleep.