donniedarko I have exactly the same symptoms, the last time I got a continuous 7/8 hours was before my accident. I seem to wake after around 4 hours for some mysterious reason. I think it may be due to underlying anxiety, I sleep better, as in fall back to sleep easier if I' m in a good frame of mind. Some studies have shown concussion sufferers have lower levels of melatonin, not sure that correlates with lower seratonin levels or inefficient conversion going off. I also have tinnitus which can be bothersome some days which doesn't help. I think the only solution is to accept waking up in the night is OK and just a phase.