ADHD treats with Lisdexamfetamine. Amfetamines, I repeat. People use this to study, to get high at parties, to be functional at work, so I really doubt there aren't patients out there abusing these drugs with valid prescriptions.
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