The SHUTi Program: SHUTi is a self-guided (i.e., automated), interactive, and tailored web-based program modeled on the primary tenants of face-to-face CBT-I (sleep restriction, stimulus control, cognitive restructuring, sleep hygiene, relapse prevention). Intervention content is metered out over time through 6 "Cores." Users obtain access to a new Core based on a time and event-based schedule (e.g., 7 days after completion of previous Core). This schedule is consistent with the recommendation from a task force commissioned by the Academy of Sleep Medicine, which deemed that an average of 6 - 8 sessions constitutes "adequate treatment exposure"(Morin et al.,2006). The SHUTi program relies on user-entered online Sleep Diaries to track progress and to tailor treatment recommendations (i.e., assign a "sleep restriction" window). Each Core acts as an online analog for the weekly sessions typically used when delivering CBT-I in a face-to-face format, following the same general structure: 1) Core objectives (what will be learned and why this information is important), 2) review of previous week's homework and sleep diary data, 3) new intervention material, 4) assignment of homework (treatment strategies for the coming week), and 5) a summary of the Core's main points. Intervention content is enhanced through a variety of interactive features, including personalized goal-setting, graphical feedback based on inputted symptoms, animations / illustrations to enhance comprehension, quizzes to test user knowledge, patient vignettes, and video-based expert explanation. Automated emails are also sent to encourage program adherence.