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Introduction: Sleep is vitally important for the improvement of cancer outcomes, but evaluation of sleep in the primary brain tumor (PBT) population is limited. This analysis aims to provide preliminary data on the consistency/reliability of sleep-related patient-reported outcomes (PROs) and to assess sleep symptom severity with both PROs and objective sleep measurements. Methods: PBT patients ³ 18 years wore a Fitbit smart-wearable device for 4 weeks, which captured objective sleep measures (total sleep time, sleep latency, nap odds/number/duration, and wake after sleep onset (WASO)). The Morningness-Eveningness Questionnaire (MEQ) was completed at baseline, PROMIS Sleep-Related Impairment (SRI) and Sleep Disturbance (SD) Short-Forms were completed at baseline and at the end of the study, and daily sleep diaries were done during the final week. Descriptive statistics were used to describe …