A wandering mind is a unhappy spirit
Scientists collected real-time data from an app called 'track your happiness'. the app asks users to record how they feel during their daily activities and to note their thoughts on the task at hand. 5000 people from 83 countries participated which provided 250000 data points.
This data showed that our minds are constantly wandering. It also recorded that we are "less happy" when our thoughts wander than when they do not.
Even when we daydream about pleasant ideas and happy things, we are still not as happy as when we are focused on what we are doing in the present moment