You are in office or having works but not enough attention on tasks. Its really really harmful. But should make a solution. Isn't it?
Just change your mind movement if you haven't faced it daily or often. But If you have facing this problem repeatedly then you have to look for a good solution.
Sometimes, the influx of work and daily to-dos are stressful for many of us. Our brains will likely become exhausted on more than a few occasions so we need to remember how to relax the mind!