The purpose of this study is to examine quality of sleep and the relationship between sleep and a protein called ferritin (iron stores) in adolescents.
Participants will visit National Jewish Health twice. At the first visit, they will learn about the study, how to use a wristwatch that tracks sleep and activity for one week, and how to complete a daily diary.
During the one-week study period between the first and second visits, participants will wear the sleep watch, complete the daily diary, and spend at least 7.5 hours in bed every night.
At the second visit, participants will return the sleep watch, review the data from the watch, complete questionnaires about their sleep, and have a blood draw.