A Touch of Madness

Sounds far too familiar. What's worked for me is; lay off the caffeine. all of it. Then, schedule (and stick to it) an hour of downtime before actually going to bed. This last is particularly important if you're spending hours doing the same task and then just stopping and trying to sleep. If you can't manage actual relaxing decompression time before bed, at least switch to a *completely different* task, so your brain isn't still chugging along out of inertia. ymmv, etc.