I suspect the reason you've not found any instances of this question is because Abilify is one of the least sedating APs for *most* people.

Having said that though, I had the same experience as yourself. I was taking naps during the day as well as sleeping long hours at night. I thought my body would just adjust after a few weeks but I didn't so I switched medication. Although I had some day-time sleepiness when I first started Risperidone, it's now worn of for me so it's just sleeping long hours at night time that is left, which is much more manageable.

As an aside, I don't think 10 hours sounds that excessive for someone on APs. I personally sleep for 11-12 hours a night.