BACKGROUND: Sleep problems after concussion may impact recovery. Early research has primarily focused on subjective sleep measures; however, actigraphy data may help objectively understand sleep patterns after pediatric concussion. PURPOSE: To determine association between subjective and objective sleep measures among pediatric athletes with concussion. METHODS: Pediatric athletes evaluated within 14 days of concussion were given a wrist-worn activity tracker, to be worn full-time, including during sleep. During initial visit and follow up evaluation at clearance for return to play (RTP), athletes completed the Pittsburgh Sleep Quality Index (PSQI). PSQI measures included self-reported sleep duration, time spent in bed, and sleep quality, while activity tracker actigraphy data was used for objective sleep duration, time spent in bed and time spent in each sleep stage. RESULTS: A total of 12 individuals (mean age=15.0±1.8 yrs; 42% female) completed initial concussion evaluation (mean=7.4±3.3 days post-injury), and follow-up evaluation at RTP clearance (mean=21.7±18.9 days post-injury). There was no significant difference in amount of sleep recorded using self-reported (7.9±1.2 hrs) and actigraphy (7.3±0.7 hrs) measures (p=0.10), or for amount of time spent in bed per night (8.8±1.6 vs. 8.2±0.7 hrs; p=0.25). Self-reported and actigraphy measures were highly and significantly correlated for amount of sleep per night (r=0.73; p=0.04) but not for amount of time spent in bed (r=0.59; p=0.12). Participants spent an average of 12±3% awake, 20±4% in REM sleep, 51±4% in light sleep, and 17±2% in deep sleep per night. Those who reported very good sleep quality on PSQI at RTP clearance visit had significantly more time in deep sleep (17.9±1.2% vs. 16.0±0.8% of the night; p=0.04) and significantly less time in light sleep (48.4±1.8% vs. 52.8±2.9% of the night; p=0.04) than those who reported fairly good or fairly bad sleep quality. CONCLUSIONS: There was no difference in subjective and objective measures for sleep duration and time spent in bed. Actigraphy data was highly correlated with self-reported measures for sleep duration following concussion. Minor differences in light and deep sleep proportions were present between pediatric athletes who reported very good sleep vs fairly good/fairly bad sleep quality.