IL10 and concussion: In linear regression models of the potential predictive value of sleeper type on cytokine level in this cohort, the subset of mTBI patients who reported clinically significant sleep complaints (considered “poor” sleepers) had elevated levels of EV IL-10 compared to mTBI “good” sleepers, after controlling for age, sex and BMI: ß (SE) = 0.12 (0.04), p < 0.01 (Figure 2A).