andrewl,

There is not much you can do to speed up your recovery. The symptoms you are experiencing are very common. You need time, rest, and good nutrition. Not the kind of nutrition you would need for endurance. Brain nutrition is based on B-6, B-12, E, C, Omega 3's, Niacin, folic acid, and all the anti-oxidants plus minerals, etc.

Did you finish your race after the concussion?

You fatigue is due to over-attending. Your brain has spent its energy doing too many things and specifically, too many things at once. Add physical exhaustion to it and you have a double whammy.

The deep sleep is good. It means your brain is getting the full rest it needs. Your brain's neurons only heal during REM sleep. This requires full sleep, not just dozing naps. If you can find ways to get this deep sleep, do it as often as you can. Many of us have a difficulty getting to a full sleep cycle.

Spontaneous recoveries can take three months or more. There is no rhyme or reason to how long it takes, except for those who have suffered multiple concussions. They can expect a longer recovery and less recovery from each subsequent concussion.

Limit your caffeine and MSG or processed soy foods. Limit alcohol to one serving per day. And, rest and more rest.

My best to you.