One link between having a higher IQ and staying up later has been found in some studies. This means that smart people may be more likely to sleep in strange ways. One idea behind this is that people with higher IQs tend to do more artistic and intellectually stimulating things, which can make them more likely to stay up late at night, when they're usually most focused or inspired. How... https://www.medzsquare.com/au/modalert-200