**Health Behavior Intervention for Adults With Type 1 Diabetes** Type 1 diabetes (T1D) is a condition where the body doesn't produce enough insulin, a hormone that helps control blood sugar. In this study, researchers want to see if improving sleep can help people with T1D manage their diabetes better. They are testing a program called CB-sleep, which uses motivational interviews to teach better sleep habits. Participants will be split into two groups: one group will try CB-sleep, and the other will receive usual care. The study will last for 9 months with check-ins at 3, 6, and 9 months. Participants will fill out questionnaires and wear a monitor to track sleep and blood sugar levels. Key Points: - **Study Length**: 9 months with check-ins. - **Participants Needed**: Ages 18-40 with T1D for at least a year and sleep issues. - **Activities**: Answer surveys and wear a monitor for sleep and glucose tracking. This study hopes to find out if better sleep can help people with T1D control their blood sugar and feel less stressed. Participants will help researchers understand the connection between sleep and diabetes management.