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Scientists have discovered a rare mutation in the SIK3 gene that enables certain individuals, called “natural short sleepers,” to thrive on significantly less sleep without negative health effects. This genetic variation allows the brain to complete its essential restorative functions more efficiently during shorter sleep periods. Unlike most people, natural short sleepers wake up refreshed after only four to six hours of rest. The SIK3 mutation joins previously identified genes such as DEC2 and ADRB1, which are also linked to reduced sleep needs. These findings shed light on how genetics influence sleep patterns and may help researchers develop new treatments for sleep disorders. #fblifestyle