With the medicine causing you to be over sleepy, do you think it would be a good idea to get an accommodation under the Americans with Disabilty Act (e.g starting at 9:30 vs 8) or would taking it intermittently (you get up to 12 weeks in a calendar year/ total of 480 hours) would be better?

You would need to get a dr to complete a medical certification stating that your illness prevents you from participating in major life activities. I'd talk your dr about it but sometimes Drs are reluctant to endorse FMLA