Lagr,
No my doctor didn't say how long the anxiety could last...at least I don't remember him saying anything about it. I was never an overly anxious person before the injury.... other than wanting to be on time and meet deadlines etc.
Here is a good article that helps explain how brain injury disrupts sleep cycles.
http://www.webmd.com/brain/news/2010...eping-problems
It talks about injured brains not producing enough Melatonin and spending more time in non-REM sleep. Basically brain inury disrupts the functions that regulate sleep.
People with brain injuries have more symptoms of anxiety and depression but
It goes on to state that sleep difficulties may lead to depression rather than depression leading to sleep difficulties.