[manifoldgeo]

If you have ADD or ADHD, Ritalin might help. I have severe ADHD that I refused to treat for decades, but I recently gave in.

I am _hugely_ sensitive to caffeine and feel a buzz even from decaf. It ruins my sleep in a similar way to what a couple people in this thread describe.

I take 10mg of instant-release Ritalin at 7AM each day, and it allows me to focus and deliver. It wears off by around 2-3PM, and I sleep like a rock most nights.

There are downsides as well: once it wears off, it leaves you mentally drained until you've slept. Also, there's a potential for building a tolerance, as well as potential for addiction. I've been lucky in both cases so far, but ymmv.