Then add in the use of powerful stimulants (e.g. Adderall) to power through a workday, only to have that cause insomnia that night, and a wrecked sleep schedule for the following 3 days.
https://stephaniesarkis.com/blog/study-finds-that-stimulant-...
The best that helps sleep in my experience is doing sports. Lots of it.
You should re-evaluate what is happening to you as it is not an ideal situation: it may be possible you have something else instead of ADHD (or together with ADHD) or you maybe taking it too late in the day.
https://aasm.org/journal-sleep-methylphenidate-can-have-slee...