Mood - I noticed several positive effects on mood, libido, and penile sensitivity, after adding hCG into the mix. Some guys don't notice a lot of difference after adding it, but I sure did.
Sleep - No change after adding hCG. Just guessing, but adding hCG usually increases testosterone levels slightly, due to testicles starting to produce some of their own again. You could just be feeling the effects of this.
Appetite - No idea about this. Mine certainly didn't decrease after adding hCG. If anything, it increased slightly. I think the whole hCG diet thing is mostly just hype to be honest, unless you're taking a LOT of it, although others may have differing opinions.