A brief summary of current research.
Rao, V, McCann, U, Han, D, Bergey, A & Smith, MT (2014). 28 (1), pp 20-26.
Researchers in this study found that people with traumatic brain injury who had sleep disturbance in the acute period after the injury were more likely to have symptoms of depression, anxiety, and apathy 12 months post-injury. This raises an important question of whether earlier treatment of sleep disturbance could help prevent later psychiatric symptoms.