Multiple studies demonstrate that fever / elevated temperature is associated with poor outcomes in brain injured patients; however, there are no conclusive studies that demonstrate that fever prevention/controlled normothermia is associated with better outcomes. This study will be conducted to assess the impact of advanced temperature control to prevent fever in brain injured patients. The fever prevention group will use the Arctic Sun Temperature Management System and will be compared to standard care patients in whom fever may spontaneously develop. If fever develops in a patient in the standard care group, they will be treated with standard fever care measures according to a step-wise algorithm, consisting primarily of intermittent antipyretics (e.g., acetaminophen) and cooling blankets and, when necessary, advanced targeted temperature management devices.