I touched my sister in her sleep
Did you touch her because you like your sister?
No, she just always tries to be the center of attention in the family.
Just because your sister gets attention, doesn't make it right for you to get her attention in a sexual way. Keep your hands to yourself and focus your affections on people that are not members of your family.
Dude it's not a big deal, if she keeps trying to get attention, I'll do it again.
It's none of your business if she tries to get attention. Sooner or later you will get caught and your parents will kick you out of the house.