How much adderall (dextroamphetamine and racemic amphetamine) is needed for hypersomnia?

Perhaps none.: Choosing a treatment for sleepiness, fatigue, narcolepsy, etc, depends upon several factors- underlying issues, related conditions, prior attempts at treatment, activity potential/level, &more. I doubt i would use Adderall at all. If med is appropriate, consider Nuvigil first; vyvanse (lisdexamfetamine) is another possibility. But you need expert professional help to get a solid diagnosis & optimal treatment.

Adderrall: It depends on the dosage and sensitivity to medication and tolerance.

Adderall (dextroamphetamine and racemic amphetamine): Usually a low dose of the immediate release form is tried first, such as 2.5 mg. - 5 mg. Once or twice daily, then the dose is raised slowly as tolerated. Discuss with your doc.