OK, used this post to get things setup, made one change, I replaced "/usr/local/sbin/mover" with "/bin/sync" since i don't have a cache drive and this way the discs sync before sleeping.
So, if I understand this correctly, with my script config, if none of my 4 media clients are on and all the hard drives are spun down (I have my drives set to spin down after 1 hour), my unraid box will go to sleep. Do I have the correct logic?
s3.txt