Impact of intermittently scanned continuous glucose monitoring with alarms on sleep and metabolic outcomes in children and adolescents with type 1 diabetes

Aims: Data about sleep quality and quantity are not available in patients with type 1 diabetes (T1D) using intermittently scanned continuous glucose monitoring (isCGM). We questioned whether the isCGM with alarms could fragment sleep in patients and parents, compared to isCGM without alarms. Methods: A prospective, observational study including 47 child-adolescents with T1D who had experience with isCGM without alarms (Freestyle Libre 1-FSL1). They were asked to wear the isCGM with alarms (Freestyle Libre 2-FSL2) for 14 days. Patients enrolled and their caregiver (s), during a 14 day period with FSL1 and the following 14 days with FSL2, completed psychosocial and sleep-related questionnaires. Furthermore they wore an actigraph that was downloaded to a web platform and processed by the validated and certified algorithm "Dormi®." Results: By the switch to the alarmed FSL2 we found about a 5% increase in Time In Range (from 62.5 to 67.8%), a reduction in time spent in hypoglycemia, number of weekly hypoglycemic events, and coefficient of variation. We did not find significant differences in sleep parameters in patients and their parents; therefore, alarms did not worsen the duration and quality of sleep. A significant improvement in the Quality of Life was perceived by parents using FSL2. Conclusions: Introduction of alarms in isCGM systems gives, in the short term, an improvement in metabolic control in terms of time in range and reduction in hypoglycemia, without worsening duration and quality of sleep, measured by actigraphy, in children-adolescent and their parents.