Schizophrenia-proneness, season of birth and sleep: Elevated schizotypy scores are associated with spring births and extremes of sleep

Schizophrenics have been reported to exhibit elevated rates of winter and spring births. The present study examined whether there is a similar effect for subjects who are purportedly schizophrenia prone, or schizotypic. Analyses are reported for 452 undergraduate college students who completed the Perceptual Aberration-Magical Ideation (PER-MAG) scale, a commonly used measure of schizotypy. It was determined that elevated schizotypy scores were associated with spring births, as well as with reports of extreme hours of sleep. Finally, for the entire sample, an unexpected relationship was also found with fall births being associated with increased hours of sleep.