I love getting a haircut, and I think it is mainly because, for those fifteen minutes, it is my job to do nothing. There is zero pressure to accomplish anything. There is no real way to use my smartphone. I can just breathe and enjoy the experience.
And, really, releasing my mind from all tasks for a chunk of time may be the best thing I do all day for my imagination, and so my productivity.
Put another way: Imagination without rest is not possible, and skill without imagination is barren.
Paul's Blog 