Daydreaming can be good for you and actually boost the brain.

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Participants were treated with transcranial direct current stimulation (tDCS), a non-invasive and painless procedure that uses low-level electricity to stimulate specific brain regions. 
The key to mind wandering was when this stimulation was applied to the frontal lobes, the team said.
  • When we daydream, brain is freed up to process tasks more effectively
  • Daydreaming 'offers a positive, simultaneous effect on task performance'
  • Team also discovered applying electric currents can trigger daydreams 
    • Daydreaming can be good for you and actually boost the brain, researchers have found.
    They say that while we daydream, the brain is actually more effective. 
    They believe that when we daydream, it is freed up to process tasks more effectively.
    According to the new study published in the Proceedings of the National Academy of Sciences, a wandering mind can impart a distinct cognitive advantage.
    Scientists at Bar-Ilan University were able to show an external stimulus of low-level electricity can literally change the way we think, producing a measurable up-tick in the rate at which daydreams – or spontaneous, self-directed thoughts and associations – occur.
    The team found this state offers a positive, simultaneous effect on task performance.
    'Over the last 15 or 20 years, scientists have shown that – unlike the localized neural activity associated with specific tasks – mind wandering involves the activation of a gigantic default network involving many parts of the brain,' Prof. Moshe Bar, part of the University's Gonda (Goldschmied) Multidisciplinary Brain Research Center said.

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