I must be on a different boat as the rest of you. I had a Moderate TBI 37 years ago. And my sleep apena problem literally "knocks me out" at bed time. I can fall asleep almost anywhere after about 4 or 5PM. I have a Mixed sleep apena. I believe that Sleep apena was caused by my TBI, but I am not sure. About 15 years ago the doctors told me i had a sleep problem and just gave me drugs to stay awake. I guess they do not feel that 37 year old injuries are worth fixing....