Alcohol. Before getting formally diagnosed and medicated, drinking was the only thing that would quiet the inner restlessness. It worked but it's not a healthy lifestyle at all.
This is something I like to bring up to people who are hesitant to medicate their kids. Yeah, I know you think Timmy is fine because he's not completely failing in school, but you should at least show Timmy that he has options and that it's OK to talk to a doctor and take medication if he needs it. He doesn't have to rely on Jack Daniels and Folgers to eek his way through life.
I had a nasty habit of waiting until the evening to do my papers in college, because that was when it was acceptable to have some wine or whiskey while I wrote. But it was amazing just how much easier it was to stay on task after having a drink, and during finals - or after college when i was on deadline - i would alternate between liters of coffee in the morning and several drinks in the evening.
Now that I'm medicated both coffee and alcohol are just occasional indulgences... well, alcohol is at least. But I didn't expect it to help curb my impulsive consumption habits like it has- it's been a game-changer.
Neurotypicals think they have this superior discipline and attitude to "get on the task", and I believed them, too! Now, medicated, I realise that they only work on these constant dopamine micro rewards in their prefrontal cortex. Which I now get, too.