A propensity for activities in the evening rather than in the morning may offer clues to behavioral problems in early adolescence, according to psychologists who have found that kids who prefer evenings are more likely to exhibit antisocial behavior, rule-breaking, and attention problems

"Morningness/eveningness refers to individual differences in sleep-wake patterns and preferences for activity and alertness during mornings or evenings,"

eveningness could make young adolescents vulnerable to antisocial behavior as well

In humans, this hormone is responsible for regulating various behavioral traits such as the fight-flight response and immune activity that are connected to sensory acuity and aspects of learning and memory

Cortisol normally spikes in the morning and falls to a plateau by afternoon and evening

Readings taken in the morning and afternoon usually show a significant drop, and scientists associate small differences in the readings with clinical depression and antisocial behavior