A new research study of sleep behavior and emotional health in adults with phenylketonuria (PKU) is being conducted by Shawn Christ and colleagues at the University of Missouri. Adults (age 18-40 years) who have previously been diagnosed with PKU are invited to participate. Study participation is all online and does not require any in-person visits. Participants will complete a brief pre-screening questionnaire over the phone, then complete brief surveys online (15-30 minutes total). Participants will receive a $10 gift card for their time. Flexible weekday or weekend scheduling. By participating in the study, you will be making a significant contribution to our understanding of PKU and how it can affect one’s sleep and emotional health. For more information or to schedule, please contact our research coordinator: Braden Hayse [573-884-8109; [email protected]].