Stimulants do help a small percentage of people sleep by calming their brain. However, too high a dose can also amp you up and interrupt sleep. You may need to back off the dose a little.
A Patient’s Primer on the Stimulant Medications Used to Treat ADHD
Penny
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism