Something I used to mention quite regularly, after having a head / brain injury, fatigue is a major consequence.
A 20 minute power nap makes the world of difference. You don't even have to fall t sleep, just relaxing totally with your eyes shut for 20 minutes really helps.
Like me, a lot of people who have suffered a head injury have trouble sleeping & I'm often up at half 4 in the mornin, but a few hours at night, providing I have a 20 minute nap in the afternoon is sufficient.
The thing is, it is quite important to only rest for 20 minutes cos after about half hour U go into a 2nd stage of sleep (26minutes is said to be the optimum but even 5 minutes does make a difference for a while.
Anyway, definitely worth giving a go, what have u got to lose ???
About 20 minutes as it goes ;o)