People with high IQ found to share a common sleep trait
A study published in the journal Personality and Individual Differences has found a correlation between bedtime and IQ levels. Participants with an IQ above 125 fell asleep at an average of 1:44 AM, while those with average IQ went to bed around 12:10 AM, and those with an IQ below 75 at approximately 11:41 PM. The authors emphasize that this is a statistical association, not a causal relationship.
A study published in the scientific journal Personality and Individual Differences has identified a statistical link between bedtime and intelligence levels. Researchers analyzed data from the American long-term Add Health study, which covered over 20,000 people. Participants with an IQ above 125 fell asleep at an average of 1:44 AM. Those with average intelligence went to bed around 12:10 AM, while those with an IQ below 75 had an average bedtime of approximately 11:41 PM. The difference between the groups exceeded one and a half hours. The differences persisted on weekends: participants with the highest IQ scores tended to wake up later and could stay in bed until about 11:00 AM. One explanation proposed by the authors relates to evolutionary psychology: people with higher cognitive abilities may find it easier to adapt to behavioral patterns that differ from those typical for humans throughout most of their evolutionary history. However, the authors emphasize that the results do not mean that staying up late boosts intelligence or that one can determine a person's IQ based on their sleep schedule. The study found a statistical association but did not establish a causal relationship. Bedtime can be influenced by work schedule, age, social environment, lifestyle, and individual circadian rhythms.