Regularly on here I've posted the difference a 20 minute nap makes & to people like ourselves, who have suffered a serious head injury, I can't recommend it enough.
Closing your eyes for 20 minutes & relaxing completely, makes the world of difference, it really does.
Now, more often that not, I do fall asleep but it's not essential & as I said to Cat who is too restless t keep her eyes closed for 20 minutes, you could try closing your eyes, totally relax & count to 100. Do that about 10 times & I'm sure that would make a difference. It certainly works for me ;o)
Give it a go, even if you're incredibly skeptical & thing it wouldn't work for u, at least give it a go - what have u got to lose - 20 minutes but U have a lifetime of extra energy t gain !!!