I have been claiming this for years. Web Surfing Helps at Work, Study Says:
According to a new study, Web browsing can actually refresh tired workers and enhance their productivity, compared to other activities such as making personal calls, texts or emails, let alone working straight through with no rest at all….Because Web-surfing can aid productivity, the researchers caution employers against over-restricting workers’ Web access. They recommend that managers allow time for limited personal Web browsing “since it has a salubrious impact on employees’ productivity,” while limiting access to personal emails.
It has happened to me many times that I am stuck on a problem and just come up with a solution. Then I spend a few minutes “wasting time” on some website and the answer comes to me. Nice to see it substantiated in a study.