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.
According to Kanazawa, ancestral humans were typically diurnal, and that a shift towards more nocturnal activities is an "evolutionarily novel preference" of the type normally found in more intelligent individuals, demonstrating "a higher level of cognitive complexity" in the practitioners.
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.
Morningness or eveningness are often genetically-based, according to researchers Lambertus Klei at Carnegie Mellon Univesity, Patrick Rietz at the University of Pittsburgh and their associates. 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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Topic: Smart people SLEEP LATE (Read 895 times)