[osmirik]

This is something I struggle with too! One thing that's helped me lately is to adopt the Pomodoro Technique: work with laser-like intensity on one thing for a short burst, then take a break and slack for a few minutes. With a timer set to keep you on track, you can gradually increase the length of the focused "dashes," and if you're on a roll at the end of a dash, you can always extend and keep going.