Circadian Mechanisms, Glucose, and CV Risks in T1D

Inclusion Criteria: * Adults 18-50 years with a clinical diagnosis of T1D for at least one year * Report habitual sleep irregularity ≥1 hour/week * Desire to improve sleep, and own a smartphone (Android or iPhone) Exclusion Criteria: * Self-reported A1C within the past 6 months ≥10% * insomnia symptoms defined as Insomnia Severity Index score ≥15 * history of restless leg syndrome * history of severe hypoglycemia (defined as hypoglycemic episode that results in loss of consciousness, seizure, or requiring emergency room visit or hospitalization) within the past 6 months * rotating shift or night work or routinely sleeping after 3 AM. * use of sleep medications/aids, significant medical comorbidities (such as heart failure, cirrhosis, chronic obstructive pulmonary disease requiring oxygen, active treatment for cancer, on renal replacement therapy \[dialysis\]) * depression (Patient Health Questionnaire 8 \[PHQ-8\] score ≥15) * history of stroke with neurological deficits * pregnant, breast feeding, or planning pregnancy, as sleep and glucose are known to change during pregnancy and breastfeeding. * Allergy to lidocaine Participants who passed the first screen by phone will be scheduled for a consenting visit at UIC