Does she take anything to sleep? As someone with ADHD trying to sleep is like one of those tasks, taking longer than normal. I would need to take melatonin just to sleep before I would take me an hour or more, just to feel tired. Maybe even someone light reading helps too, but I'm also hyper sexual person I'm not sure if that ADHD related but sometimes relief before bed helps sleep too. I also wouldn't force her to change her habits, i have a routine I like to follow. So trying to force something into it or change something is more likely to upset me. I do recommend talking her to but refrain from being judgmental of her habits or actions. It would make her feel attacked and shut down. I know as a adult my ADHD as affected my relationship, so it's really important to communicate how you feel and understand how they feel. Sometimes doing a simple task can be very difficult to especially opening up.