One of the most controversial and significant recent findings is the correlation in humans between the earliness/lateness of sleep preferences and intelligence.
Robert Bolizs at Semmelweist University, and his coworkers, have shown that encephalograms during sleep illustrate how sleep elements are directly related to “wakeful cognitive performance.” Studies by researchers H. Aliasson and colleagues show the timing of intervals of sleep “correlates closely” with student academic achievement…
People with higher IQs are more apt to be nocturnal night-owls. Those with lower IQs tend to restrict their activities primarily to daytime.
People who prefer to go to bed early, and who are early-risers, demonstrate “morningness,” whereas those whose sleep patterns are shifted later demonstrate “eveningness.” Researchers say eveningness tends to be a characteristic of those with higher IQs…
Recent studies at the University of Bologna suggest early-risers are comparatively more conscientious people. Related studies indicate eveningness is often age-related and that eveningness usually peaks at between 17-21 years of age; thereafter morningness becomes more prevalent.
A 2008 study by psychologist Marina Giamnietro and colleagues indicates evening-types tend to be less reliable, less emotionally stable and more apt to suffer from depression, addictions and eating disorders…
In 2008, studies at Max Planck Institute of Psychiatry demonstrated sleep-time preferences are often inherited, and subsequent data indicates that 50 per cent of sleep-time choices are dictated by genetic factors.
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