I've been taking Aricept for at least 4 years, tbi in 98. My doc gives me samples, I take 5 mg in the AM. He has also given me Razadyne, (similar family of med) and that works very well too.
I feel more alert, my retrieval is better, so too is my "further along memory, in other words, I remember more when I take the med!"
I do agree with the dreams and difficulty sleeping, if taken too late in the day.
I've tried 10 mg, and it's got more side effects, without being more helpful.
The razadyne seems to have less side effects, but I have less experience with it.

I take Namenda @ bedtime, but that's for RSD pain. It does help the aricept a bit though....

Be well!

Pete
Asb