I’d take a very hard look at the culture of RISD and your health and sleep needs with a chronic illness. The workload for studio classes is intense. While my D started out freshman year on a pretty good sleep/work schedule she often found it impossible to maintain AND she felt a weird sense of peer pressure to pull all-nighters etc. We’d try to encourage her that it’s better to find her own balance, but in a lot of ways now as a sophomore she’s succumbed to the huge amount of work hours expected and random sleep schedules. On the upside, she found she enjoys some of the ‘we’ll survive this together’ mentality of working with others at crazy hours in the studio.
But, read more about what it’s like there from current and past students so you know if the school is a good fit for you.
Also if you’re applying to schools for a BFA/art major, generally your portfolio is what determines your acceptance. It varies from school to school how much your grades will impact admission, but the portfolio is the main assessment.
You may want to check out this board too for more info http://talk.collegeconfidential.com/visual-arts-film-majors/