Zlatan Krizan

New psychology research links tired minds to unreliable evidence

While research shows sleep-related fatigue affects how we think and feel, the impact of sleep loss on the reliability of statements and confessions in the legal system has received far less attention. A new research synthesis from Iowa State researchers examines this issue, including the need for evidence‑based standards to help judges and investigators recognize and account for sleep disruption in the legal process.

March 4, 2026

How personality traits shape sleep quality

Zlatan Krizan (Hannah Olson-Wright) According to research by an Iowa State University psychologist, how well you sleep may depend as much on your personality as it does on your habits. Zlatan Krizan, professor of psychology, has spent more than a decade studying how personality traits affect both the perception and…

June 9, 2025

Study finds fatigued officers struggle with investigations

New research by Zlatan Križan, psychology, indicates officers who are fatigued have a harder time collecting information that could bring justice to victims.

May 10, 2023

Professor of Psychology Zlatan Krizan appointed editor in chief of Journal of Research in Personality

Professor of Psychology, Zlatan Krizan, has been appointed editor in chief of the Journal of Research in Personality. Published by Elsevier, the Journal of Research in Personality is one of the top journals in personality psychology. The journal has a 5-year impact factor of 3.61 and a high…

November 3, 2020

Lack of sleep intensifies anger, impairs adaptation to frustrating circumstances

New Iowa State University research shows that losing just a couple hours of sleep at night makes you angrier, especially in frustrating situations.

November 27, 2018

Teens sacrifice sleep when they spend more time on electronic devices

The temptation to respond to social media notifications and text messages from friends is keeping more and more teens awake at night.

October 19, 2017