Objective: To compare the sleep-wake characteristics of individuals who have sustained a mild traumatic brain injury (mTBI) between 1–6 months ago to noninjured controls. Method: Fourteen community-dwelling individuals with an mTBI (Mage = 28.07; SD = 10.45; n = 10 female) and 34 noninjured controls (Mage = 23.7; SD = 7.30; n = 31 female) completed an online battery of self-report measures, including: the PROMIS® Sleep-Related Impairment (PROMISa) and Sleep Disturbance (PROMISb) 8-item short forms; the Epworth Sleepiness Scale (ESS); and, the Insomnia Severity Index (ISI). Participants also completed 14 days of activity monitoring via wrist worn Actigraphs. Results: mTBI participants reported experiencing more sleep-related impairment on the PROMISa (M = 62.66; SD = 9.09) than controls (M = 56.02; SD = 8.80), p = .027, d = 0.76. The proportion of mTBI participants who met ISI criteria for mild or severe clinical insomnia were significantly greater (85.7%) than controls (47.1%), x2 = 6.10, p = .023. No significant differences were found for the ESS and PROMISb scales. There were no significant differences between groups on actigraphically-measured sleep-wake metrics (i.e., activity, sleep duration, sleep fragmentation, night-time immobility, sleep efficiency, sleep onset latency, and wake after sleep onset) with the exception of sleep timing: On average, mTBI participants went to sleep earlier (MD = −1:03, p = .002, d = 0.92), awoke earlier (MD= −0:47, p = .031, d = 0.62), and had an earlier sleep mid-point (MD = −0:59, p = .003, d = 0.86) than did controls. Conclusion: Although some subjective measures indicated greater impairment for mTBI participants than controls, such differences were not evident on actigraphically-measured sleep. The benefit of strategies to improve sleep quality in patients with mTBI, such as CBTi, should be tested.