[dmos62]

Let me step back a tad and comment on your use case, i.e. needing to be reminded to work and not procrastinate. I largely solved this problem by adopting the Pomodoro technique. Following it, I subdivide my work time into periods of concentrated work (20mn in my case) and relaxation (3-5mn). This increases my effective work stamina very much, helps with motivation, and has other benefits. Related literature is plentiful.