<qa>  What is the CAP?The proposed study will begin to address the gap in knowledge about the nature, incidence and effect of sleep disturbances on recovery from moderate-to-severe TBI during the early rehabilitation period. It will also pilot a sleep hygiene protocol to improve sleep for individuals in the early rehabilitation phase after TBI. It will employ 24-hour per day sleep observations and actigraphy to characterize the incidence and type of sleep disturbances in the early rehabilitation phase of TBI. In addition, the study will serially test participants multiple times a week with the Orientation Log OLOG and the Confusion Assessment Protocol CAP to closely monitor changes in alertness, orientation, attention, memory functions and behavior as they emerge from PTA. The sleep observations and actigraph information can then be compared to the cognitive measures of PTA to examine the relationship of sleep quantity and quality on cognitive functions during recovery from PTA. 