Canadian researchers have found that babies who are considered "difficult" or anxious at 5 months or later could develop nightmares during preschool. Their characteristics at infancy were good indicators about whether or not they could have consistently bad dreams as preschoolers.

Psychiatrists explain how they predicted children to have these consistent nightmares based on this data. Bad dreams were then shown to occur as early as two and a half years old. Researchers say if parents comfort them after it could lower the chances of recurring nightmares later.

Are there any parents out there who can attest to this study? All children have nightmares at one point or another. This seems like a valid connection between infant temperament and preschool sleeping patterns. But parents know their kids better than men in lab coats, so maybe this provides a little insight if anything.