For sleep, I sometimes take Melatonin. I take one an hour before bed, it doesn't make you groggy or dopey just a little tired. I have a good nights sleep and in the morning I feel pretty good!
I've taken sleeping pills and I HATE the way they make me feel. Jittery, cold and very weak.
For the racing mind, can I suggest your Dad look into meditation? I don't want to sound like a new age fluffball, but I've been meditating for a couple of years now and the results have been very positive.
I'm calmer, more centered and can see things as they are in the present moment. Before, my mind was racing to the future ("what's my family going to do?" etc), or it would dwell in the past pre-ALS.
Anyway, that's my 2 cents.
Cheers and goodluck to you and your Dad!