Roughly, zero. Stimulants are not a fun dependency, come with a bucket list of side effects and downsides, and only mitigate one aspect of ADHD.
But the majority will not. Treating ADHD through stimulants usually has fantastic outcomes for patients.
Sleepy therapy (CBT-I) may be the best supported treatment for insomnia, but it's still quite shit. ~50% of people will see little to no improvement after going through therapy.
does it though? this comment section should be testament to everyone on meds still struggling