The Healthy Adolescent Development Project (HAD) is a prospective longitudinal study funded by a grant from the National Institute on Drug Abuse (NIDA), which examines neurocognitive susceptibility factors and consequences of marijuana abuse among adolescents in a community with high prevalence rates of early adolescent marijuana use. The 529 children being interviewed in this wave range in ages from 12-15. Included in their interviews is a sleep habits module, since literature shows a clear connection between unhealthy sleep habits and illicit drug use. To explore this connection, we developed a sleep diary feasibility and mode study. By implementing this study we hoped first to learn about the feasibility of having our adolescent sample members complete a detailed 7 day sleep diary. Second, we aimed to compare two different modes for collecting sleep habits data. In addition, we wanted to learn the extent to which risk for drug abuse influenced compliance in completing these surveys. We worked with a sub-sample (n=136) of our study children at various levels of risk of illicit drug use, as determined in Wave 1. Within their risk groups the children were randomly selected to receive either a diary programmed on a Samsung Galaxy Tab or a paper and pencil (PAPI) diary. Both diaries are identical in content. The children were asked to keep the diary of their sleep habits over the course of 7 consecutive days. The findings we present from the sleep diary study about its feasibility, the mode effects we encountered, data quality and compliance issues have important implications for other researchers hoping to gather more detailed data from their study subjects.